[Hylte] Add cobrand

[jonkri]

Hylte kommun is a municipality in Sweden. Their cobrand is running on https://hylte.fixamingata.se/. 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]

[codecov]

Codecov Report

Attention: Patch coverage is 15.90909% with 37 lines in your changes missing coverage. Please review.

Project coverage is 54.88%. Comparing base (ce80472) to head (151e66e).
Report is 181 commits behind head on master.

Files	Patch %	Lines
perllib/FixMyStreet/Cobrand/Hylte.pm	17.94%	32 Missing ⚠️
perllib/FixMyStreet/Cobrand/FixaMinGata.pm	0.00%	5 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (ce80472) and HEAD (151e66e). Click for more details.

HEAD has 14 uploads less than BASE

Flag	BASE (ce80472)	HEAD (151e66e)
	15	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5048       +/-   ##
===========================================
- Coverage   82.65%   54.88%   -27.78%     
===========================================
  Files         396      343       -53     
  Lines       30828    25131     -5697     
  Branches     4890     4740      -150     
===========================================
- Hits        25482    13793    -11689     
- Misses       3900    10018     +6118     
+ Partials     1446     1320      -126     

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[jonkri]

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