Hide deleted and 'zero' categories on dashboard page

[nephila-nacrea]

Visibility can be toggled, similar to /admin/body/ page.

Fixes https://github.com/mysociety/societyworks/issues/5187.

Changes include:

• When on 'Category' or 'Category and state' tab
  • JS-generated button to toggle visibility of categories with no reports
  • JS-generated button to toggle visibility of deleted categories
  • Buttons do not appear when 'category' filter used
    • Instead, only the selected categories are displayed
  • Respective buttons do not appear if no zero-report categories or no deleted categories
  • If JS disabled, zero-report and deleted categories are still highlighted
  • Special handling of 'Multiple' grouping

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 82.63%. Comparing base (a0a71d2) to head (efa13e0).

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/App/Controller/Dashboard.pm	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5796      +/-   ##
==========================================
- Coverage   82.64%   82.63%   -0.01%     
==========================================
  Files         457      457              
  Lines       35714    35725      +11     
  Branches     5821     5822       +1     
==========================================
+ Hits        29517    29523       +6     
- Misses       4499     4503       +4     
- Partials     1698     1699       +1     

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