fix: Broken action buttons in thumbnail view

[fsbraun]

Description

I propose this PR as an alternative to removing #1255 in #1344. It fixes the dysfunctional UI without removing functionality from the repo:

• The $.actions() extension of django.jQuery is not present in current versions of Django. This PR removes them. The call of $.actions() lead to the JS execution to be stopped only in the thumbnail view. In the table view it just raised an error on the console.
• Django's admin JS sets the selected class automatically in the table view, but not in the thumbnail view. This has been added and leads to the activation of the action buttons in the thumbnail view.
• For no apparent reason, the thumbnail view's JS waited for the page to be loaded twice.
• Also updates the jQuery UI version

No changes are made to the python code base (and the improvements to it from #1344 would need to be added in a second PR).

Related resources

• 1344

• 1343

• 1255

• Django admin's legacy actions jQuery extension which was removed in Django 3.2

Checklist

• [x] I have opened this pull request against master
• [ ] I have added or modified the tests when changing logic
• [x] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [x] 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.

[codecov[bot]]

Codecov Report

Merging #1345 (7541503) into master (0bbbe88) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1345   +/-   ##
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  Coverage   72.40%   72.40%           
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  Files          72       72           
  Lines        3269     3269           
  Branches      532      532           
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  Hits         2367     2367           
  Misses        735      735           
  Partials      167      167