Finalize v2.8.0 release

[IAlibay]

Release checklist

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

Developers certificate of origin

• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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