fix: update pauli arithmetic to handle abstract coefficients when jitted

[andrijapau]

Context:

def f(c1, c2):
    op = c1 * qml.X(0) + c2 * qml.X(0)
    op.simplify()

jax.jit(f)(1.0, 1.0)

would fail due to pauli arithmetic not being able to handle these abstract coefficients.

Description of the Change:

Handle the possibility of abstract coefficients.

Benefits:

After testing in Catalyst, PennyLaneAI/catalyst#2023, seems like it should fix this bug and latest/latest/latest.

Possible Drawbacks: None identified.

Fixes #8191

[sc-98660]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.69%. Comparing base (4d684c6) to head (0238411).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8190   +/-   ##
=======================================
  Coverage   99.69%   99.69%           
=======================================
  Files         548      548           
  Lines       56845    56845           
=======================================
  Hits        56672    56672           
  Misses        173      173           

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