Fixing PPR decomposition in qml.transforms.decompose

[lazypanda10117]

Adding support for decomposing PauliRot using the (python-based) graph decomposition system. Previously, the following example would not work, leaving the PauliRot op unchanged in the IR.

qp.capture.enable()
qp.decomposition.enable_graph()

@qp.qjit(keep_intermediate=2)
@qp.decompose(gate_set=[qml.RZ, qml.MultiRZ, qml.RX, qml.GlobalPhase])
@qp.qnode(qml.device("lightning.qubit", wires=1))
def circuit():
  qp.PauliRot(0.5, pauli_word="X", wires=[0])
  return qp.expval(qml.Z(0))

print(circuit.mlir_opt)

This PR also re-enables skipped tests that previously failed due to PauliRot decomposition.

[[sc-119011]]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.95%. Comparing base (139e8f9) to head (a708424).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2803   +/-   ##
=======================================
  Coverage   96.95%   96.95%           
=======================================
  Files         169      169           
  Lines       18875    18884    +9     
  Branches     1799     1801    +2     
=======================================
+ Hits        18300    18309    +9     
  Misses        409      409           
  Partials      166      166           

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[kipawaa]

Great to see this support added! It looks good, I'd just like to see a couple more tests

[maliasadi]

@lazypanda10117 please create a PR targeting the rc branch to raise an error 🐛

[kipawaa]

Great, thank you!