Update cirq resolver to check sympy singletons with is instead of ==

[NoureldinYosri]

No description provided.

[senecameeks]

Confirmed that this resolves the error.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.66%. Comparing base (50d7198) to head (8292d94).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7279   +/-   ##
=======================================
  Coverage   98.66%   98.66%           
=======================================
  Files        1106     1106           
  Lines       96042    96042           
=======================================
  Hits        94764    94764           
  Misses       1278     1278           

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[pavoljuhas]

Confirmed that this resolves the error.

@senecameeks - can you please add a test for that error, ie, failing before and passing after this change?