Update extension deps and UI test CI workflows

[mwouts]

This is a rebased version of #1300

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: or .

Also, the version of Jupytext developed in this PR can be installed with pip:

HATCH_BUILD_HOOKS_ENABLE=true pip install git+https://github.com/mwouts/jupytext.git@pr_1300_rebased

(this requires nodejs, see more at Developing Jupytext)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.04%. Comparing base (93cf493) to head (540d069).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1312   +/-   ##
=======================================
  Coverage   97.04%   97.04%           
=======================================
  Files          29       29           
  Lines        4499     4499           
=======================================
  Hits         4366     4366           
  Misses        133      133           

Flag	Coverage Δ
external	75.07% <ø> (?)
functional	88.39% <ø> (?)
integration	77.28% <ø> (?)
unit	66.48% <ø> (?)

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