[N/land] Pass category updates to/from Alloy

[nephila-nacrea]

Fixes https://github.com/mysociety/societyworks/issues/4648.

[skip changelog]

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 82.49%. Comparing base (702d107) to head (09ebd76).

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/Cobrand/Northumberland.pm	0.00%	4 Missing and 1 partial ⚠️
perllib/Open311/UpdatesBase.pm	0.00%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@                         Coverage Diff                         @@
##           nland-assigned-to-extra-details    #5289      +/-   ##
===================================================================
- Coverage                            82.51%   82.49%   -0.03%     
===================================================================
  Files                                  406      406              
  Lines                                31732    31742      +10     
  Branches                              5049     5054       +5     
===================================================================
  Hits                                 26185    26185              
- Misses                                4056     4063       +7     
- Partials                              1491     1494       +3     

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[dracos]

Looks good; perhaps a quick check that group is one of the $contact->group would make sense, though if they don't match, not sure what we would do, so perhaps doesn't really matter!

[nephila-nacrea]

Looks good; perhaps a quick check that group is one of the $contact->group would make sense, though if they don't match, not sure what we would do, so perhaps doesn't really matter!

@dracos So I had actually faffed with this a bit, then realised it might not work or be hard to correct if, on the Alloy end, someone edited the category, forgot to change the group, but later edited the group. It would probably come in as two separate edits our end, but then one or neither would apply because of the group-must-match-category checks.