gh-105730: support more callables in ExceptionGroup.split() and subgroup()

[iritkatriel]

Fixes #105730.

• Issue: More callables should be usable as Exception Group predicates #105730

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📚 Documentation preview 📚: https://cpython-previews--106035.org.readthedocs.build/

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 RHEL8 LTO + PGO 3.x has failed when building commit d8ca5a1.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/78/builds/4694) and take a look at the build logs.
4. Check if the failure is related to this commit (d8ca5a1) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/78/builds/4694

Failed tests:

• test.test_asyncio.test_subprocess

Failed subtests:

• test_subprocess_consistent_callbacks - test.test_asyncio.test_subprocess.SubprocessFastWatcherTests.test_subprocess_consistent_callbacks
• test_subprocess_consistent_callbacks - test.test_asyncio.test_subprocess.SubprocessThreadedWatcherTests.test_subprocess_consistent_callbacks

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

430 tests OK.

10 slowest tests:

• test_concurrent_futures: 2 min 20 sec
• test_multiprocessing_spawn: 1 min 33 sec
• test_signal: 1 min 14 sec
• test_multiprocessing_forkserver: 1 min 9 sec
• test_multiprocessing_fork: 1 min 6 sec
• test_io: 38.3 sec
• test_socket: 37.0 sec
• test_imaplib: 32.1 sec
• test_unparse: 28.3 sec
• test_subprocess: 27.6 sec

1 test failed:
test.test_asyncio.test_subprocess

15 tests skipped:
test.test_asyncio.test_windows_events
test.test_asyncio.test_windows_utils test_devpoll test_gdb
test_ioctl test_kqueue test_launcher test_startfile test_tkinter
test_ttk test_winconsoleio test_winreg test_winsound test_wmi
test_zipfile64

1 re-run test:
test.test_asyncio.test_subprocess

Total duration: 2 min 24 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/test/test_asyncio/test_subprocess.py", line 788, in test_subprocess_consistent_callbacks
    self.loop.run_until_complete(main())
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/asyncio/base_events.py", line 664, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/test/test_asyncio/test_subprocess.py", line 780, in main
    self.assertEqual(events, [
AssertionError: Lists differ: [('pi[29 chars]t'), 'process_exited'] != [('pi[29 chars]t'), ('pipe_data_received', 2, b'stderr'), 'pi[57 chars]ted']


Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/test/test_asyncio/test_subprocess.py", line 788, in test_subprocess_consistent_callbacks
    self.loop.run_until_complete(main())
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/asyncio/base_events.py", line 664, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/test/test_asyncio/test_subprocess.py", line 780, in main
    self.assertEqual(events, [
AssertionError: Lists differ: [('pi[29 chars]t'), 'pipe_connection_lost', ('pipe_data_recei[33 chars]ted'] != [('pi[29 chars]t'), ('pipe_data_received', 2, b'stderr'), 'pi[57 chars]ted']

[gvanrossum]

Looks like a racy/flaky test (asyncio + subprocess, no less).