Skip filename with a path element in the skip list

[DimitriPapadopoulos]

• Start with a test that shows failure to skip argument /path/to/ingoredir with --skip=ignoredir.
• Then fix the test by skipping filename /path/to/ingoredir with a path element in the skip list (--skip=ignoredir)

Fixes #3196 (comment).

[DimitriPapadopoulos]

@larsoner Can you have a look? This PR should fix #3196 reported by @yarikoptic.

[larsoner]

Tests are failing after a very long timeout.

1. Can you see why?
2. One possibility is that while never exits. I usually prefer for ii in range (100): ... or similar just in case something misbehaves.
3. Can you change the timeout on the jobs to be like 10-20 minutes? For example like this: https://github.com/mne-tools/mne-python/blob/ec87fd8976a82ef7541c3114cd7955083eb278d6/.github/workflows/tests.yml#L20

[DimitriPapadopoulos]

Strange, it did work from the command line, but probably before I changed the existing code into a function 😄