Remove use of prospector and related tools and Codacy

[bouweandela]

Description

We have now switched to ruff for linting, so we can stop using prospector and related tools. Since all linter rules enabled in ruff are enforced by pre-commit.ci, we no longer need Codacy either.

Closes #2528
Closes #2684

Link to documentation: https://esmvaltool--2818.org.readthedocs.build/projects/ESMValCore/en/2818/contributing.html#code-quality

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.45%. Comparing base (464ddee) to head (984e01a).
⚠️ Report is 59 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2818      +/-   ##
==========================================
- Coverage   95.46%   95.45%   -0.01%     
==========================================
  Files         260      260              
  Lines       15510    15510              
==========================================
- Hits        14806    14805       -1     
- Misses        704      705       +1     

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[valeriupredoi]

brilliant! We're finally here, cheers @bouweandela 🍺

[valeriupredoi]

I think you can safely close #1005 with this too