[MAINT] switch to ruff, per napari/napari

[psobolewskiPhD]

Just to make life easier, switching this repo to also use ruff like napari/napari, instead of flake8 and isort.
Also dropped some old Conda cruft from tox.ini which wasn't used.

After making the tooling changes, I also ran ruff and made various fixes to get everything to pass.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (3d45bd5) 86.02% compared to head (b2a89ce) 85.90%.

Files	Patch %	Lines
napari_animation/_qt/savedialog_widget.py	0.00%	1 Missing ⚠️
napari_animation/viewer_state.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
- Coverage   86.02%   85.90%   -0.12%     
==========================================
  Files          26       24       -2     
  Lines        1073     1043      -30     
==========================================
- Hits          923      896      -27     
+ Misses        150      147       -3     

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[GenevieveBuckley]

This looks good to me.
Since the ruff CI test is passing, I say go ahead and merge.

[GenevieveBuckley]

Great, thank you for this @psobolewskiPhD 🎉