Rani Pinchuk fd8f42d3d1 gh-135427: Fix DeprecationWarning for os.fork when run in threads with -Werror (GH-136796) ...

Don't ignore errors raised by `PyErr_WarnFormat` in `warn_about_fork_with_threads`
Instead, ignore the warnings in all test code that forks. (That's a lot of functions.)

In `test_support`, make `ignore_warnings` a context manager (as well as decorator),
and add a `message` argument to it.
Also add a `ignore_fork_in_thread_deprecation_warnings` helper for the deadlock-in-fork
warning.

2025-08-26 15:33:21 +02:00

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