gh-138709: Supress stdout/stderr during test_sampling_profiler tests

[pablogsal]

• Issue: Implement CPU time profiling in profiling.sample #138709

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x Fedora Stable LTO 3.x (tier-3) has failed when building commit cb6fed0.

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/#/builders/1654/builds/1199) and take a look at the build logs.
4. Check if the failure is related to this commit (cb6fed0) 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/#/builders/1654/builds/1199

Failed tests:

• test_interpreters

Failed subtests:

• test_keyboard_interrupt_in_thread_running_interp - test.test_interpreters.test_api.InterpreterObjectTests.test_keyboard_interrupt_in_thread_running_interp

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-s390x.lto/build/Lib/test/test_interpreters/test_api.py", line 462, in test_keyboard_interrupt_in_thread_running_interp
    self.assertEqual(retcode, 0)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^
AssertionError: -2 != 0

[ZeroIntensity]

Agh, sorry, I think that failure is my fault. I'll look into it.

[pablogsal]

No problem! Thanks for looking into it

[ZeroIntensity]

For Petr reading the failures in the morning: #139219 is the fix.