gh-119494 Fix error messages for deleting/setting type attributes

[da-woods]

Deleting is always an error and doesn't depend on mutability.

Setting is tested after deleting.

• Issue: Wrong error message when trying to delete type __name__ #119494

[JelleZijlstra]

There's some failing tests in test_descr, could you update the error message there?

[da-woods]

@JelleZijlstra done

[iritkatriel]

Linter is complaining about the news file.

[da-woods]

I'll fix it later today - I can see what's wrong but I don't think I can rename the file from my phone

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows PGO NoGIL 3.x (tier-1) has failed when building commit ac5c5d4.

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/1622/builds/2696) and take a look at the build logs.
4. Check if the failure is related to this commit (ac5c5d4) 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/1622/builds/2696

Failed tests:

• test_tracemalloc
• test.test_multiprocessing_spawn.test_misc

Failed subtests:

• test_wait_integer - test.test_multiprocessing_spawn.test_misc.TestWait.test_wait_integer

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "C:\Users\Administrator\buildarea\3.x.itamaro-win64-srv-22-aws.nogil.pgo\build\Lib\contextlib.py", line 85, in inner
    return func(*args, **kwds)
  File "C:\Users\Administrator\buildarea\3.x.itamaro-win64-srv-22-aws.nogil.pgo\build\Lib\test\_test_multiprocessing.py", line 5612, in test_wait_integer
    self.assertLess(delta, expected + 2)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
AssertionError: 7.376583200064488 not less than 5