WIP Group filter on map pages

[nephila-nacrea]

WIP

For https://github.com/mysociety/societyworks/issues/4637.

Currently parked because we will need to add a 'group' column to the 'problem' table and index it; search will be too slow otherwise.

[codecov]

Codecov Report

❌ Patch coverage is 30.30303% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.72%. Comparing base (bdf42f7) to head (39ce95c).

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/App/Controller/Around.pm	40.00%	15 Missing ⚠️
perllib/FixMyStreet/DB/ResultSet/Problem.pm	0.00%	6 Missing and 1 partial ⚠️
perllib/FixMyStreet/App/Controller/Reports.pm	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (bdf42f7) and HEAD (39ce95c). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (bdf42f7)	HEAD (39ce95c)
	10	4

Additional details and impacted files

@@                               Coverage Diff                                @@
##           remove-unused-display_location_extra_params    #5790       +/-   ##
================================================================================
- Coverage                                        82.64%   32.72%   -49.93%     
================================================================================
  Files                                              457      449        -8     
  Lines                                            35708    35357      -351     
  Branches                                          5820     5754       -66     
================================================================================
- Hits                                             29511    11570    -17941     
- Misses                                            4499    22965    +18466     
+ Partials                                          1698      822      -876     

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