[FMS] Add parent categories to dashboard categories view

[MorayMySoc]

Add a parent categories column to show if a category is a subcategory.

Arbitrary decision to choose the first parent category from the groups method of a contact.

https://github.com/mysociety/societyworks/issues/1458

[skip changelog]

[MorayMySoc]

I'll need to fix and add tests, but I wanted to check that we were agreed this is what's meant to be achieved

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6ecf711) 0.00% compared to head (b986a12) 85.47%.

❗ Current head b986a12 differs from pull request most recent head 5b34f3c. Consider uploading reports for the commit 5b34f3c to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4700       +/-   ##
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+ Coverage        0   85.47%   +85.47%     
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  Files           0      340      +340     
  Lines           0    25022    +25022     
  Branches        0     4842     +4842     
===========================================
+ Hits            0    21388    +21388     
- Misses          0     2206     +2206     
- Partials        0     1428     +1428     

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[MorayMySoc]

Ok, ultimately copied the wards stuff once I understood what was going on - but as far as I see it needs to have the labels selectable in some way (either by click or input check) to select the whole group. Gone in a bit of a long loop on this, so that's actually probably what the real work of this ticket was!

[MorayMySoc]

Changes the dropdown for categories in the dashboard stats to be multi-select checkboxes instead of only allowing selecting one category.

Adds group labels to group categories in the 'categories' dropdown menu of the dashboard with an all-group-name checkbox to select all of subcategories for that group.

Some conversation: https://mysociety.slack.com/archives/C01TK8P1K8T/p1700759729180759

https://github.com/mysociety/societyworks/issues/1458

[dracos]

Looking better, one issue with the template change, and hopeful couple of simplifications :)

[dracos]

Looking good, just one thing more for me checking I've understood it right :)

[dracos]

Thanks! All seems to work as expected :) I actually just spotted in TfL you also don't need to check the first bit of that condition now as you know it will be an arrayref, but it's fine as is as well.

[MorayMySoc]

Sorry to force a re-review but figured I may as well get that done too - but wanted to check I haven't misunderstood and got it wrong either.

[dracos]

No worries, yes, that's what I meant - think ->category is guaranteed to be an arrayref now, which makes things bit neater :)