Use SINTEF/ci-cd callable workflows

[CasperWA]

Remove invoke dependency and tasks.py as these are no longer needed. Also remove .github/utils as everything in this folder is no longer needed.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (67f7b41) 33.69% compared to head (105ea30) 33.69%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #528   +/-   ##
========================================
  Coverage    33.69%   33.69%           
========================================
  Files           20       20           
  Lines         2419     2419           
========================================
  Hits           815      815           
  Misses        1604     1604           

Flag	Coverage Δ
optimade-client	33.69% <ø> (ø)

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