tests: posix: common: split posix_threads_ext tests into standalone test #81490
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Description
Is your enhancement proposal related to a problem? Please describe.
Make the posix_threads_ext-related tests in tests/posix/common into a standalone test.
Describe the solution you'd like
The obvious way to group posix_threads_ext-related testsuites is by POSIX_THREADS_EXT Option Group.
Describe alternatives you've considered
The way the testsuite has been designed historically.
It's probably fine to group the POSIX_THREADS_EXT tests into this suite as well.
Additional context
See #79454 for more info