🔧 Add in-progress cancellation to CI workflows

[burgholzer]

Per default, GitHub keeps workflows running even if new commits are added to a pull request.
This is wasteful and requires lots of manual cancellations to free up available runners.
This PR adds the corresponding settings to cancel in-progress jobs whenever new commits become available by adding

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

snippets to all the workflow files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.1%. Comparing base (2bbf867) to head (d742158).
Report is 875 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #108   +/-   ##
=====================================
  Coverage   91.1%   91.1%           
=====================================
  Files         20      20           
  Lines       1726    1726           
  Branches     411     411           
=====================================
  Hits        1573    1573           
  Misses       153     153           

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