[Enfield] Initial cobrand.

[dracos]

Fixes https://github.com/mysociety/societyworks/issues/5194
Fixes https://github.com/mysociety/societyworks/issues/5235

[codecov]

Codecov Report

❌ Patch coverage is 74.35897% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.23%. Comparing base (2ffc4b9) to head (a65b276).
⚠️ Report is 40 commits behind head on master.

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/Cobrand/Enfield.pm	71.87%	5 Missing and 4 partials ⚠️
perllib/FixMyStreet/Geocode/OSPlaces.pm	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5749      +/-   ##
==========================================
+ Coverage   82.66%   83.23%   +0.57%     
==========================================
  Files         455      458       +3     
  Lines       35512    38722    +3210     
  Branches     5783     6646     +863     
==========================================
+ Hits        29355    32232    +2877     
- Misses       4467     4740     +273     
- Partials     1690     1750      +60     

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[chrismytton]

Nice! 👌