Fix bug where unexpected queuing occurs in qml.ctrl among other functions

[KetpuntoG]

This PR seeks to fix this bug.

The issue was that unwanted operators were being added when applying the qml.ctrl, qml.prod, qml.cond and qml.adjoint functions if they were located as arguments or kwargs.

To solve it I do a recursive search, for operators inside args and kwargs and I remove them.

Drawback:

This will delete it always. I can't think of a case where we want to add an operator to the queue by passing it as an argument.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.70%. Comparing base (de54c54) to head (342a92c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6284   +/-   ##
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  Coverage   99.70%   99.70%           
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  Files         444      444           
  Lines       42133    42151   +18     
=======================================
+ Hits        42008    42026   +18     
  Misses        125      125           

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[astralcai]

qml.cond also contains similar logic. Can you also update that to use this recursive method?

[astralcai]

Maybe move this helper method to the tape module and just call it something like recursively_remove_operators_from_queue.

[KetpuntoG]

Sounds good, is okey in tape/operation_recorder.py?

[astralcai]

Might be more suitable in pennylane/queueing.py actually.

[KetpuntoG]

qml.cond also contains similar logic. Can you also update that to use this recursive method?

I tried this but it seems qml.cond only accept operators, not functions as qml.ctrl or qml.adjoint