Deprecate on_keyboard_interrupt callback hook

[daniellepintz]

What does this PR do?

This callback hook will be subsumed by the new on_exception hook (#9183).
The PR includes small addition to the is_overridden helper function, to automatically set the parent to Callback if a Callback instance is passed, which made changes to configuration_validator.py simpler.

Does your PR introduce any breaking changes? If yes, please list them.

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Did you have fun?

Make sure you had fun coding 🙃

[awaelchli]

LMTG

[daniellepintz]

Waiting to merge - will incorporate fix for #9286

[Borda]

Waiting to merge

there are still some failing tests, mind have look?

[codecov]

Codecov Report

Merging #9260 (a6299a8) into master (ccc83e7) will decrease coverage by 4%.
The diff coverage is 100%.

❗ Current head a6299a8 differs from pull request most recent head 21b8abe. Consider uploading reports for the commit 21b8abe to get more accurate results

@@           Coverage Diff           @@
##           master   #9260    +/-   ##
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- Coverage      92%     88%    -4%     
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  Files         176     178     +2     
  Lines       14810   14854    +44     
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- Hits        13662   13093   -569     
- Misses       1148    1761   +613