Tests suite improvement ideas

[cderv]

This issue is here to track improvement ideas for ou tests suites

Testing built versions

• Scheduled test on our latest build version (would help surface customwriter.lua missing from share resource in quarto-prelease exe bundle #4257 maybe)

Computations

• Testing with latest versions of R, Python and Julia packages
• Testing with dev versions of some R, Python and Julia packages
• Testing with pinned version of some know package to insure no regression (e.g for jupyter_client 8 issues #4122 where jupyter-client 7 or 8 will have difference and we want to support boths)

Test performance

• Improve speed of commit testing - parallelization ?
• Running tests on Windows #4099
• Add some in-browser testing using playwright #10696

Publishing

• We need to test quarto publish before release somehow
  • quarto publish connect on v1.8.24 throws No such file or directory (os error 2): stat 'site_libs/quarto-html/axe/axe-check.js' #13396

[cderv]

• Labeling of gt-tables is broken #5657 is an example where we did not catch an issue with gt