[CI] Cleanup workflows 🧹

[christophfroehlich]

• Some files were not deleted during the backports
• delete wrong workflow_dispatch fields

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.57%. Comparing base (ccf1529) to head (039dd61).

Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #1070      +/-   ##
==========================================
- Coverage   72.82%   72.57%   -0.26%     
==========================================
  Files          40       40              
  Lines        3555     3555              
  Branches     1787     1786       -1     
==========================================
- Hits         2589     2580       -9     
- Misses        655      670      +15     
+ Partials      311      305       -6     

Flag	Coverage Δ
unittests	72.57% <ø> (-0.26%)	⬇️

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see 2 files with indirect coverage changes