Add canary tests for lab 4.1 and notebook 7.1 prereleases

[bollwyvl]

Checklist

• ran doit lint locally

References

• fixes Test with JupyterLab 4.1 and Notebook 4.1 prereleases #63

Code changes

• add canary environment
• refactor epochal tasks (probably could do more)
• update tests
• update keyboard shortcut selectors
• ???

User-facing changes

• ???

Backwards-incompatible changes

• ???

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0e1adff) 93.14% compared to head (55c618a) 93.66%.
Report is 1 commits behind head on main.

❗ Current head 55c618a differs from pull request most recent head d4c6432. Consider uploading reports for the commit d4c6432 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   93.14%   93.66%   +0.52%     
==========================================
  Files          16       16              
  Lines        1327     1327              
  Branches      274      274              
==========================================
+ Hits         1236     1243       +7     
+ Misses         46       42       -4     
+ Partials       45       42       -3     

Flag	Coverage Δ
front-end	93.62% <ø> (+0.53%)	⬆️

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