tests: group skip wrappers & make them optional

[Borda]

What does this PR do?

We may have a lot of silently skipped tests, so let's keep then for skip on PR but always run on master or release...

Workload:

• find and group test wrappers to a single module
• patch Workflows to allow skip on PR

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

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📚 Documentation preview 📚: https://torchmetrics--2372.org.readthedocs.build/en/2372/

[codecov]

Codecov Report

Merging #2372 (d95bb7c) into master (ff701bb) will decrease coverage by 0%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #2372   +/-   ##
======================================
- Coverage      69%     69%   -0%     
======================================
  Files         305     305           
  Lines       17180   17180           
======================================
- Hits        11840   11839    -1     
- Misses       5340    5341    +1     

[Borda]

let's add The pr skip to CI when we see some issues 🐿️