[Dumfries] Cobrand & Integration

[davea]

This PR is made up of individually-reviewed PRs:

• [Dumfries] Added front-end #5736

[skip changelog]

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.60%. Comparing base (ad4e47c) to head (c67d862).

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/Cobrand/Dumfries.pm	42.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5741      +/-   ##
==========================================
- Coverage   82.61%   82.60%   -0.01%     
==========================================
  Files         457      458       +1     
  Lines       35690    35697       +7     
  Branches     5814     5814              
==========================================
+ Hits        29484    29488       +4     
- Misses       4513     4517       +4     
+ Partials     1693     1692       -1     

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