Finalize v2.8.0 release

[IAlibay]

Release checklist

• Updated version in package/MDAnalysis/version.py, package/setup.py, testsuite/MDAnalysisTests/init.py, and testsuite/setup.py
• Complete CHANGELOG
• Set any max pins necessary (none necessary)

Developers certificate of origin

• I certify that this contribution is covered by the LGPLv2.1+ license as defined in our LICENSE and adheres to the Developer Certificate of Origin.

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📚 Documentation preview 📚: https://mdanalysis--4780.org.readthedocs.build/en/4780/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.64%. Comparing base (e6bc096) to head (07df13c).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4780      +/-   ##
===========================================
- Coverage    93.66%   93.64%   -0.03%     
===========================================
  Files          177      189      +12     
  Lines        21742    22808    +1066     
  Branches      3055     3055              
===========================================
+ Hits         20365    21358     +993     
- Misses         930     1003      +73     
  Partials       447      447              

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