Revert special handling of PhaseShift in ctrl

[astralcai]

Context:
Multi-wire controlled PhaseShift should not be converted to a one-less-wire controlled ControlledPhaseShift

Description of the Change:

• qml.ctrl no longer convert multi-wire controlled PhaseShift to a one-less-wire controlled ControlledPhaseShift
• Special handling of multi-wire controlled PhaseShift in decompositions

Benefits:

1. Fixes test failing in lightning
2. Correct decomposition of multi-wire controlled PhaseShift

[albi3ro]

Thanks for the fast turnaround 🎉

I think that adding the backslash to the link should pacify sphinx, but if not we can just remove the duplicate link.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (127beeb) 99.69% compared to head (066a3dd) 99.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5148      +/-   ##
==========================================
- Coverage   99.69%   99.68%   -0.01%     
==========================================
  Files         394      394              
  Lines       36075    35801     -274     
==========================================
- Hits        35964    35689     -275     
- Misses        111      112       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[trbromley]

Multi-wire controlled PhaseShift should not be converted to a one-less-wire controlled ControlledPhaseShift

What do we currently do in the case where there is a single control wire on the PhaseShift? Do we still convert it to a ControlledPhaseShift?

[astralcai]

Multi-wire controlled PhaseShift should not be converted to a one-less-wire controlled ControlledPhaseShift

What do we currently do in the case where there is a single control wire on the PhaseShift? Do we still convert it to a ControlledPhaseShift?

Yes we do.