Fix cotransform of quantum_fisher

[dwierichs]

Context:
quantum_fisher does not respect the classical Jacobian of a QNode, because its classical_cotransform is not set.

Description of the Change:
Set the same classical_cotransform as adjoint_metric_tensor and metric_tensor.

Benefits:

Possible Drawbacks:

Related GitHub Issues:
Fixes #6345

Related Shortcut Stories:
[sc-75092]

[albi3ro]

👍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.39%. Comparing base (aae08b7) to head (0340a9e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6350      +/-   ##
==========================================
- Coverage   99.71%   99.39%   -0.32%     
==========================================
  Files         445      445              
  Lines       42285    42286       +1     
==========================================
- Hits        42165    42031     -134     
- Misses        120      255     +135     

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