Redirect legacy commands to the ImageJ UI

[gselzer]

As we found out in #205, there are too many edge cases when we try to run original ImageJ PlugIns within napari. So let's instead make it as easy as possible to open up the ImageJ UI, and simultaneously prevent users from executing them within napari.

I do like that we maintain them in the search window, though, as otherwise people might not realize that all of this functionality is available.

[gselzer]

TODO: Test legacy commands divert to ImageJ UI

[codecov-commenter]

Codecov Report

Patch coverage: 57.57% and project coverage change: -0.26 ⚠️

Comparison is base (3b31818) 89.62% compared to head (e9c40e0) 89.36%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #207      +/-   ##
==========================================
- Coverage   89.62%   89.36%   -0.26%     
==========================================
  Files          48       48              
  Lines        4394     4456      +62     
==========================================
+ Hits         3938     3982      +44     
- Misses        456      474      +18     

Impacted Files	Coverage Δ
src/napari_imagej/widgets/result_runner.py	90.00% <ø> (ø)
src/napari_imagej/widgets/menu.py	76.42% <40.57%> (-1.45%)	⬇️
tests/widgets/test_menu.py	71.81% <65.85%> (-0.04%)	⬇️
src/napari_imagej/java.py	80.65% <87.50%> (-0.84%)	⬇️
src/napari_imagej/widgets/result_tree.py	91.66% <100.00%> (ø)
src/napari_imagej/widgets/widget_utils.py	91.89% <100.00%> (+1.56%)	⬆️
tests/utils.py	95.85% <100.00%> (+0.10%)	⬆️

... and 3 files with indirect coverage changes

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