Add notebook testing capabilites in Interactive

[rahulbshrestha]

Related PR: https://github.com/scverse/spatialdata-notebooks/pull/46

[LucaMarconato]

I merged the other PR, thanks for the contribution. Please pull from main before continuing.

[codecov-commenter]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (f889c52) 75.77% compared to head (928b718) 74.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #151      +/-   ##
==========================================
- Coverage   75.77%   74.58%   -1.19%     
==========================================
  Files          16       16              
  Lines        1717     1759      +42     
==========================================
+ Hits         1301     1312      +11     
- Misses        416      447      +31     

Files	Coverage Δ
src/napari_spatialdata/utils/_test_utils.py	69.04% <16.66%> (-20.96%)	:arrow_down:
src/napari_spatialdata/_interactive.py	60.60% <33.33%> (-25.51%)	:arrow_down:

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[giovp]

I think this can actually be closed as I don't think it will be worked on further

[melonora]

ok, I would say it would be good to add tests for notebooks though, but low priority for now.