[Code cleanup] Remove legacy about dialog #4038

[depperm]

Fixes #4038

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• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Is this change backwards compatible? For example, developers won't need to change how they are calling the API or how they've extended core plugins such as Tables or Plots.

Author Checklist

• Changes address original issue?
• Unit tests included and/or updated with changes?
• Command line build passes?
• Has this been smoke tested?
• Testing instructions included in associated issue?

[codecov]

Codecov Report

Merging #4368 (cef39f0) into master (5caa5e1) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head cef39f0 differs from pull request most recent head cbccd74. Consider uploading reports for the commit cbccd74 to get more accurate results

@@            Coverage Diff             @@
##           master    #4368      +/-   ##
==========================================
- Coverage   69.79%   69.75%   -0.04%     
==========================================
  Files        1029     1022       -7     
  Lines       36847    36799      -48     
  Branches     1589     1589              
==========================================
- Hits        25716    25668      -48     
+ Misses      10728    10727       -1     
- Partials      403      404       +1     

Impacted Files	Coverage Δ
src/installDefaultBundles.js	100.00% <ø> (ø)
...c/plugins/persistence/couch/CouchObjectProvider.js	69.56% <0.00%> (-0.44%)	⬇️
src/plugins/imagery/components/ImageryTimeView.vue	72.88% <0.00%> (+0.56%)	⬆️

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[jvigliotta]

This looks great @depperm, thank you!