[bugfix] Make qml.equal work with qml.HilbertSchmidt

[dwierichs]

Context:
qml.HilbertSchmidt has QuantumScript instances as hyperparameters, which are not compared correctly by the default Operator dispatch of qml.equal.

Description of the Change:
This PR adds a custom dispatch branch for qml.HilbertSchmidt to qml.equal, comparing the QuantumScript hyperparameters with additional qml.equal calls.

Benefits:
bug fix

Possible Drawbacks:

Related GitHub Issues:
fixes #5536

[sc-61589]
[sc-49174]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.67%. Comparing base (d03216e) to head (3278c12).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #5538    +/-   ##
========================================
  Coverage   99.67%   99.67%            
========================================
  Files         407      407            
  Lines       38019    37750   -269     
========================================
- Hits        37895    37628   -267     
+ Misses        124      122     -2     

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