Test all notebooks vs stable cirq after the release

[pavoljuhas]

Make all notebook tests use stable cirq and synchronize SKIP_NOTEBOOKS
in notebook_test.py and isolated_notebook_test.py so the same sets
of notebooks test vs cirq head and vs last cirq release.

Ref: https://github.com/quantumlib/Cirq/blob/main/docs/dev/notebooks.md#lifecycle

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.66%. Comparing base (c1e2fe4) to head (2c76aeb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7255      +/-   ##
==========================================
- Coverage   98.66%   98.66%   -0.01%     
==========================================
  Files        1106     1106              
  Lines       96050    96052       +2     
==========================================
- Hits        94769    94765       -4     
- Misses       1281     1287       +6     

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[mhucka]

LGTM