[misc] Rename reference scripts & corr CI job paths

[felixdittrich92]

This PR:

• Now after removing the TF backend we can also rename the reference scripts without the framework extension

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.54%. Comparing base (183f0ff) to head (fedaf9a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1985      +/-   ##
==========================================
+ Coverage   96.53%   96.54%   +0.01%     
==========================================
  Files         141      141              
  Lines        6025     6025              
==========================================
+ Hits         5816     5817       +1     
+ Misses        209      208       -1     

Flag	Coverage Δ
unittests	96.54% <ø> (+0.01%)	⬆️

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