Expand python format CI check to all code but third-party (#28437)

Expand python formatting check CI workflow (which uses `black`) to the
entire repo except `third-party/` and `test/`, and `black`en all
affected files once to begin with.

Also:
- Manually run `2to3` on files that `black` failed to process (as a
one-off), which was due to them being written for Python 2.
- Set `black` CI check to use latest available (currently `26.1.0`,
previously pinned to `24.4.0`).
- Add `push` workflow trigger so this runs on pushes to `main`.

[reviewed by @DanilaFe, thanks!]

Testing:
- [x] CI check passes
- [x] CI check fails on incorrectly formatted python files
- [x] paratest

Author: arifthpe

.github/workflows/python-format-CI.yml

@@ -1,12 +1,6 @@
 name: CI Format Check
 
-on:
-  pull_request:
-    paths:
-      - 'tools/chapel-py/**/*.py'
-      - 'tools/chplcheck/**/*.py'
-      - 'tools/chpl-language-server/**/*.py'
-  workflow_dispatch:
+on: [push, pull_request, workflow_dispatch]
 
 jobs:
   check-format:
@@ -15,6 +9,5 @@ jobs:
       - uses: actions/checkout@v4
       - uses: psf/black@stable
         with:
-          options: "--check --verbose --line-length 80"
-          src: "./tools/chapel-py ./tools/chplcheck ./tools/chpl-language-server"
-          version: "24.4.0"
+          options: "--check --verbose --line-length 80 --extend-exclude '(third-party/|test/)'"
+          src: "."

compiler/etc/chpl_lldb_debuggerBreakHere.py

@@ -7,6 +7,9 @@ def debuggerBreakHere_callback(frame, bp_loc, internal_dict):
     if fn and fn.name.startswith("debuggerBreakHere("):
         thread.SetSelectedFrame(2)
 
+
 def __lldb_init_module(debugger, internal_dict):
-    debugger.HandleCommand('breakpoint command delete debuggerBreakHere')
-    debugger.HandleCommand('breakpoint command add --python-function chpl_lldb_debuggerBreakHere.debuggerBreakHere_callback debuggerBreakHere')
+    debugger.HandleCommand("breakpoint command delete debuggerBreakHere")
+    debugger.HandleCommand(
+        "breakpoint command add --python-function chpl_lldb_debuggerBreakHere.debuggerBreakHere_callback debuggerBreakHere"
+    )