gh-139686: Make reloading a lazy module no-op

[QEDady]

Currently, reloading a not-yet materialized lazy module fails. This PR changes it to be a no-op. This makes sense since the reloading will happen anyway when the module is materialized e.g. by accessing an attribute.

• Issue: Reloading a lazy module that has not yet been materailized should be no-op #139686

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[brettcannon]

Minor tweaks to the tests, but otherwise LGTM!

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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[QEDady]

I have made the requested changes; please review again

[QEDady]

I have made the requested changes; please review again

Also, currently the following test:

./python -m test test.test_os.test_os

fails with

test test.test_os.test_os failed -- Traceback (most recent call last):
  File "/usr/local/google/home/amere/cpython/Lib/test/test_os/test_os.py", line 1011, in test_utime_fd
    self._test_utime(set_time)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/usr/local/google/home/amere/cpython/Lib/test/test_os/test_os.py", line 920, in _test_utime
    self.assertAlmostEqual(st.st_atime, atime_ns * 1e-9, delta=1e-6)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 1760084197.4864256 != 1.002003 within 1e-06 delta (1760084196.4844227 difference)

because of

sys.modules['importlib.util'] = util

at the top level of the test_lazy.py. Removing the latter makes ./python -m test test_importlib fails with test_lazy failure although ./python -m test test_importlib.test_lazy works fine in all cases. That is because some other test likely reloads importlib.util. See here. Please, advise.

[bedevere-app]

Thanks for making the requested changes!

@brettcannon: please review the changes made to this pull request.