Increase coverage of `inspect.getcoroutinelocals`

[sobolevn]

Right now one branch of inspect.getcoroutinelocals is not covered at all:

I have a PR ready.

Linked PRs

• gh-138750: Increase coverage of inspect.getcoroutinelocals #138751

[serhiy-storchaka]

What is the use case for coroutine without cr_frame?

Look at the test for getgeneratorlocals(). gi_frame is removed for exhausted generators. I think that the test for getcoroutinelocals() should test a finished coroutine -- this is the more natural test case.