Chore/multiple fixes ci pre commit

[theissenhelen]

fixes/updates:

• correct downstream-ci-hpc workflow call
• ignore pre-commit-config and readthedocs for changelog updates
• updates pre-commit config

adds:

• merge strategy for CHANGELOG.md
• adds CODEOWNERS file

[FussyDuck]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.83%. Comparing base (9998fe9) to head (e839a3c).
Report is 11 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop       #5      +/-   ##
===========================================
- Coverage    92.10%   91.83%   -0.27%     
===========================================
  Files            2        3       +1     
  Lines           76       98      +22     
===========================================
+ Hits            70       90      +20     
- Misses           6        8       +2     

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