chore: CI/testing improvements for parallel test execution

[adrianlyjak]

• Rename workflows-dev to just dev for easier typing. Move it to the workspace root to make that less vacant. Makes sense as the default package for monorepo management
• Add pytest-xdist to all the packages
• Add timeouts to all the packages pytest commands to prevent test hangs
• Use module-scoped async fixtures for future compatibility with dbos (I think initializes from active loop)
• Remove mypy in favor of basedpyright/ty type checking
• Add test-docker CI job for integration tests with testcontainers
• Exclude integration tests from Python 3.9/3.14 in CI matrix (3.9 for future dbos, and 3.14, as those are run by the test-docker job)

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Latest commit: 2186841

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[coveralls]

Pull Request Test Coverage Report for Build 21601882670

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-9.3%) to 78.761%

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Totals
Change from base Build 21552583841:	-9.3%
Covered Lines:	5288
Relevant Lines:	6714

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💛 - Coveralls