fix #363: Better UX in versioning listview

[jrief]

Description

Fixes #363

Allow max two checked checkboxes when comparing versions.

Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

This pull request is for review and testing. I actually don't know how to add a unit test since it's client functionality only.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.89%. Comparing base (f90c5b2) to head (5ef01fc).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #364   +/-   ##
=======================================
  Coverage   90.88%   90.89%           
=======================================
  Files          72       72           
  Lines        2546     2548    +2     
  Branches      361      361           
=======================================
+ Hits         2314     2316    +2     
  Misses        168      168           
  Partials       64       64           

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[fsbraun]

Great idea! I am going to test the UX.

One thought comes to my mind ahead of time: There might be other bulk actions in the future which might require more than 2 versions selected. To make this PR future-proof, would it be possible to check if the option value="compare_versions" is the only one?