CLN: Fix tests not executed by pytest

[Dr-Irv]

We have tests that are not beginning with the word test_ so then pytest doesn't execute them. Need to rename them and then see if they really work.

test_api_types.py:def check_extension_dtypes() -> None:
test_frame.py:def df_accepting_dicts_iterator() -> None:
test_frame.py:def series_added_in_astype() -> None:
test_io.py:def btest_read_fwf():
test_timefuncs.py:def fail_on_adding_two_timestamps() -> None:

[ramvikrams]

All these test work fine when adding test_ before them, but when running pyright the test_read_excel in test_io.py gives this pytest.PytestUnraisableExceptionWarning

[Dr-Irv]

All these test work fine when adding test_ before them, but when running pyright the test_read_excel in test_io.py gives this pytest.PytestUnraisableExceptionWarning

I'd have to see it. Could be a version issue.

[ramvikrams]

Sure Sir

[twoertwein]

When a released pandas includes this pandas-dev/pandas#50397, we could re-use that script for pandas-stubs