Override __copy__ method for QSVT instances

[Mandrenkov]

Context:

Unfortunately, #5226 introduced a regression which causes the QSVT in Practice demo to fail. The issue is that the current implementation of Operator.__copy__() copies the data of an Operator before other attributes are copied; however, this is not suitable for QSVT since the QSVT data property depends on the _hyperparameters attribute.

Description of the Change:

• Added a QSVT.__copy__() method to ensure the data attribute is ignored when QSVT instances are copied.

Benefits:

• The QSVT in Practice demo succeeds.

Possible Drawbacks:

None.

Related GitHub Issues:

None.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.67%. Comparing base (eb03750) to head (796324b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5248      +/-   ##
==========================================
- Coverage   99.68%   99.67%   -0.01%     
==========================================
  Files         399      399              
  Lines       36853    36574     -279     
==========================================
- Hits        36736    36456     -280     
- Misses        117      118       +1     

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[timmysilv]

[albi3ro]

Optional comment about testing, but thanks for fixing this :)