More sophisticated measurement validation for default-qubit

[astralcai]

Description of the Change:
Add measurement-specific observable validations to measurement validation

[sc-64700]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.67%. Comparing base (6d0a528) to head (162c66b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5890      +/-   ##
==========================================
- Coverage   99.67%   99.67%   -0.01%     
==========================================
  Files         426      426              
  Lines       40924    40654     -270     
==========================================
- Hits        40791    40520     -271     
- Misses        133      134       +1     

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[mudit2812]

Couple of non-blocking comments.

[lillian542]

Looks good! 🚀

I guess moving away from a fixed set of observables to this check regarding diagonalizing gates creates the opportunity to define your own observables. Since that's sort of an 'added functionality' here, should we add a test for it?