Feature/"Close workflow" button

[schoinh]

• Upon clicking "Close workflow" button, dialog box appears as a OS-standard modal
• Cancel button works (simply closes the modal)
• "Close workflow" button works (takes you back to the workflow selection page, and resets the SegmenterModel in state)

The commit list is showing a bunch of commits from a previous PR -- that's because I squashed the commits when I merged the last PR. But if you look under Files Changed it shows the correct changes for this PR.

Pull request recommendations:

• [x] Name your pull request your-development-type/short-description. Ex: feature/read-tiff-files
• [x] Link to any relevant issue in the PR description. Ex: Resolves [gh-12], adds tiff file format support
• [x] Provide context of changes.
• [x] Provide relevant tests for your feature or bug fix.
• [ ] Provide or update documentation for any feature added by your pull request.

Thanks for contributing!

[codecov[bot]]

Codecov Report

Merging #63 (da152c0) into main (fa55083) will decrease coverage by 0.85%. The diff coverage is 71.42%.

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
- Coverage   92.54%   91.68%   -0.86%     
==========================================
  Files          27       27              
  Lines         858      890      +32     
==========================================
+ Hits          794      816      +22     
- Misses         64       74      +10     

Impacted Files	Coverage Δ
...apari_aicssegmentation/view/workflow_steps_view.py	84.54% <60.00%> (-7.41%)	:arrow_down:
napari_aicssegmentation/controller/_interfaces.py	71.42% <100.00%> (ø)
...gmentation/controller/workflow_steps_controller.py	96.15% <100.00%> (+0.32%)	:arrow_up:
napari_aicssegmentation/model/segmenter_model.py	100.00% <100.00%> (ø)

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