Try to upload pytest json report as artifact.

[Carreau]

Mostly I want to investigate why tests are taking forever on CI,
like up to 45 minutes. It's hard with just printing the slowest 10
durations, as this may be dues to some test having for example many
parameters.

With this I should be able to download the artifact and analyse them.

[codecov]

Codecov Report

Merging #4518 (cef5e69) into main (580ddda) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4518   +/-   ##
=======================================
  Coverage   84.39%   84.40%           
=======================================
  Files         607      607           
  Lines       51179    51179           
=======================================
+ Hits        43195    43196    +1     
+ Misses       7984     7983    -1     

Impacted Files	Coverage Δ
napari/utils/action_manager.py	84.11% <0.00%> (+0.93%)	⬆️

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[Carreau]

The goal being to create something like the following (interactive), that show us which groups of test(s) potentially across platforms are taking the most time.

Here we see that likely we want to optimise test_add_layer, and zooming in show us that most of the time is spent there because of the large number of parameters:

[Carreau]

This allowed me to find #4521 that greatly speedup the test suite.

[Carreau]

To try, you can head to the test suite summary, download the artifacts.
And drag and drop the resulting files on this page:

https://carreau.github.io/pytest-json-report-viewer/

You will get a breakdown you can explore.

[Carreau]

Self merging again, we can refine later.