Potentially stale files related to contributions

[shayanhoshyari]

• main/.ci: seems might have been something from early google days?
• CONTRIBUTORS: This seems definitely stale. Should it just be removed? (since github tracks contributors anyway)
• CONTRIBUTING.md: Are the following still relevant:
  • Contributor License Agreement (since I don't see any googlebot checking this anymore)
  • pre-commit install: Are we really running pre-commit correctly? I tried pre-commit run --all-files and it made so many changes

pre-commit run --all-files
check for merge conflicts................................................Passed
buildifier...............................................................Passed
buildifier-lint..........................................................Passed
isort (python)...........................................................Failed
- hook id: isort
- files were modified by this hook

Fixing /Users/hoshyari/code/rules_python/gazelle/modules_mapping/test_merger.py
Fixing /Users/hoshyari/code/rules_python/gazelle/python/testdata/dependency_resolution_order/__init__.py
Fixing /Users/hoshyari/code/rules_python/gazelle/python/testdata/from_imports/import_nested_var/__init__.py
Fixing /Users/hoshyari/code/rules_python/gazelle/python/testdata/relative_imports_package_mode/package1/subpackage1/subpackage2/script.py
Fixing /Users/hoshyari/code/rules_python/python/private/pypi/whl_installer/wheel.py
Fixing /Users/hoshyari/code/rules_python/tests/pypi/whl_installer/platform_test.py

black....................................................................Failed
- hook id: black
- files were modified by this hook

reformatted gazelle/manifest/copy_to_source.py
reformatted docs/conf.py
reformatted gazelle/python/testdata/relative_imports_package_mode/package1/subpackage1/__init__.py
reformatted gazelle/python/testdata/relative_imports_package_mode/package1/subpackage1/some_module.py
reformatted gazelle/python/testdata/relative_imports_package_mode/package1/subpackage1/subpackage2/script.py
reformatted python/bin/repl_stub.py
reformatted python/private/get_local_runtime_info.py
reformatted python/private/site_init_template.py
reformatted python/private/pypi/dependency_resolver/dependency_resolver.py
reformatted tests/integration/custom_commands_test.py
reformatted tests/cc/current_py_cc_headers/abi3_headers_linkage_test.py
reformatted tests/integration/local_toolchains/local_runtime_test.py
reformatted python/private/pypi/whl_installer/wheel.py
reformatted sphinxdocs/private/sphinx_build.py
reformatted examples/wheel/wheel_test.py
reformatted python/runfiles/runfiles.py
reformatted tests/runtime_env_toolchain/toolchain_runs_test.py
reformatted tests/pypi/whl_installer/platform_test.py

All done! ✨ 🍰 ✨
18 files reformatted, 479 files left unchanged.

Update deleted packages..................................................Failed
- hook id: update-deleted-packages
- files were modified by this hook

# Generated via './tools/update_deleted_packages.sh'
common --deleted_packages=examples/build_file_generation
common --deleted_packages=examples/build_file_generation/random_number_generator
common --deleted_packages=examples/bzlmod
common --deleted_packages=examples/bzlmod/entry_points
common --deleted_packages=examples/bzlmod/entry_points/tests
common --deleted_packages=examples/bzlmod/libs/my_lib
common --deleted_packages=examples/bzlmod/other_module
common --deleted_packages=examples/bzlmod/other_module/other_module/pkg
common --deleted_packages=examples/bzlmod/patches
common --deleted_packages=examples/bzlmod/py_proto_library
common --deleted_packages=examples/bzlmod/py_proto_library/example.com/another_proto
common --deleted_packages=examples/bzlmod/py_proto_library/example.com/proto
common --deleted_packages=examples/bzlmod/py_proto_library/foo_external
common --deleted_packages=examples/bzlmod/runfiles
common --deleted_packages=examples/bzlmod/tests
common --deleted_packages=examples/bzlmod/tests/other_module
common --deleted_packages=examples/bzlmod/whl_mods
common --deleted_packages=examples/multi_python_versions/libs/my_lib
common --deleted_packages=examples/multi_python_versions/requirements
common --deleted_packages=examples/multi_python_versions/tests
common --deleted_packages=examples/pip_parse
common --deleted_packages=examples/pip_parse_vendored
common --deleted_packages=examples/pip_repository_annotations
common --deleted_packages=examples/py_proto_library
common --deleted_packages=examples/py_proto_library/example.com/another_proto
common --deleted_packages=examples/py_proto_library/example.com/proto
common --deleted_packages=gazelle
common --deleted_packages=gazelle/examples/bzlmod_build_file_generation
common --deleted_packages=gazelle/examples/bzlmod_build_file_generation/other_module/other_module/pkg
common --deleted_packages=gazelle/examples/bzlmod_build_file_generation/runfiles
common --deleted_packages=gazelle/manifest
common --deleted_packages=gazelle/manifest/generate
common --deleted_packages=gazelle/manifest/hasher
common --deleted_packages=gazelle/manifest/test
common --deleted_packages=gazelle/modules_mapping
common --deleted_packages=gazelle/python
common --deleted_packages=gazelle/python/private
common --deleted_packages=gazelle/pythonconfig
common --deleted_packages=tests/integration/compile_pip_requirements
common --deleted_packages=tests/integration/compile_pip_requirements_test_from_external_repo
common --deleted_packages=tests/integration/custom_commands
common --deleted_packages=tests/integration/local_toolchains
common --deleted_packages=tests/integration/pip_parse
common --deleted_packages=tests/integration/pip_parse/empty
common --deleted_packages=tests/integration/py_cc_toolchain_registered
common --deleted_packages=tests/modules/another_module
common --deleted_packages=tests/modules/other
common --deleted_packages=tests/modules/other/nspkg_delta
common --deleted_packages=tests/modules/other/nspkg_gamma
common --deleted_packages=tests/modules/other/nspkg_single
common --deleted_packages=tests/modules/other/simple_v1
common --deleted_packages=tests/modules/other/simple_v2
common --deleted_packages=tests/modules/other/with_external_data

  (use "git restore <file>..." to discard changes in working directory)
        modified:   .bazelrc.deleted_packages
        modified:   docs/conf.py
        modified:   examples/wheel/wheel_test.py
        modified:   gazelle/manifest/copy_to_source.py
        modified:   gazelle/modules_mapping/test_merger.py
        modified:   gazelle/python/testdata/dependency_resolution_order/__init__.py
        modified:   gazelle/python/testdata/from_imports/import_nested_var/__init__.py
        modified:   gazelle/python/testdata/relative_imports_package_mode/package1/subpackage1/__init__.py
        modified:   gazelle/python/testdata/relative_imports_package_mode/package1/subpackage1/some_module.py
        modified:   gazelle/python/testdata/relative_imports_package_mode/package1/subpackage1/subpackage2/script.py
        modified:   python/bin/repl_stub.py
        modified:   python/private/get_local_runtime_info.py
        modified:   python/private/pypi/dependency_resolver/dependency_resolver.py
        modified:   python/private/site_init_template.py
        modified:   python/runfiles/runfiles.py
        modified:   sphinxdocs/private/sphinx_build.py
        modified:   tests/cc/current_py_cc_headers/abi3_headers_linkage_test.py
        modified:   tests/integration/custom_commands_test.py
        modified:   tests/integration/local_toolchains/local_runtime_test.py
        modified:   tests/runtime_env_toolchain/toolchain_runs_test.py