[3.12] gh-109860: Use a New Thread State When Switching Interpreters, When Necessary (gh-110245)#110709

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ericsnowcurrently wants to merge 9 commits intopython:3.12from ericsnowcurrently:backport-f5198b0-fix-using-wrong-tstate

+663-141

Commits on Oct 11, 2023

[3.12] pythongh-105716 : Support Background Threads in Subinterpreters Consistently (pythongh-109921 )
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Commits on Oct 12, 2023

pythongh-76785 : Use Pending Calls When Releasing Cross-Interpreter Data (pythongh-109556 )
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Move _PyCrossInterpreterData_ReleaseAndRawFree to internal API.
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Move _PyCrossInterpreterData_ReleaseAndRawFree to internal API.
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Set Py_BUILD_CORE_MODULE for _xxinterpchannelsmodule.
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[3.12] pythongh-109853 : Fix sys.path[0] For Subinterpreters (pythongh-109994 )
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Do not modify PyConfig. Add sys_path_0 to _PyRuntimeState instead.
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[3.12] pythongh-109860 : Use a New Thread State When Switching Interpreters, When Necessary (pythongh-110245 )
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Drop PyThreadState.whence.
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