[FixaMinGata] Add various updates

[jonkri]

Some minor FixaMinGata-related changes. The empty public_update.html file is intentional (we are currently not using this section of the inspect form).

• Has the code POD documentation been added or updated?
• Whether this PR should include changes to any public documentation, or the FAQ;
• All cobrand-specific commits start their commit message with the cobrand in square brackets;
• Is new functionality tested? CodeCov will warn you about the diff coverage, but won’t complain about e.g. new files;
• Will cobrand-specific changes require additional work to ensure consistent behaviour on www.fixmystreet.com?
• Are the changes tested for accessibility?
• Have you updated the changelog? If this is not necessary, put square brackets around this: [skip changelog]

Related to #4235.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.18%. Comparing base (ce80472) to head (aedbdd2).

Files	Patch %	Lines
perllib/FixMyStreet/Cobrand/FixaMinGata.pm	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (ce80472) and HEAD (aedbdd2). Click for more details.

HEAD has 13 uploads less than BASE

Flag	BASE (ce80472)	HEAD (aedbdd2)
	15	2

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5050       +/-   ##
===========================================
- Coverage   82.65%   69.18%   -13.47%     
===========================================
  Files         396      340       -56     
  Lines       30828    24586     -6242     
  Branches     4890     4649      -241     
===========================================
- Hits        25482    17011     -8471     
- Misses       3900     6224     +2324     
+ Partials     1446     1351       -95     

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[jonkri]

Hi! Is there anything we can do to help move this along? 😊