gh-152798: Revert sys.thread_info.lock to 'semaphore'/None for consistency

[Wojusensei]

Closes gh-152798

this PR reverts the change made in GH-134747 and GH-141140 that set sys.thread_info.lock to "pymutex"

the underlying lock implementation (PyMutex) has been used since python 3.13.1 and 3.14, but changing this attribute in 3.15 was both late and misleading

this revert restores the values to match Python 3.14 behavior:

• "semaphore" on POSIX platforms (linux, macOS, BSD, etc)
• None on Windows and Emscripten

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[Wojusensei]

could a maintainer plz add the skip news label? this is a tiny internal revert that doesn't affect users

Thanks! :)

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[Wojusensei]

the Windows test_logging and test_tkinter failures appear to be unrelated to this change :(
could a maintainer plz take a look? Thanks!~

[ByteFlowing1337]

Please don't force-push.
And yes, the failure of the test_logging is unrelated -- it's reported in #84649 (comment).

[Wojusensei]

请不要用力推。是的，故障与此无关——在#84649（评论）中报告。test_logging

thank u for taking a look! i wont force push on this PR anymore. and thanks for confirming the logging test is unrelated, that's good to know :)