[Merton] Adds parks and open spaces layer

[MorayMySoc]

[Merton] Adds parks and open spaces layer

Layer contains parks that Merton not responsible for:
Wimbledon Common, Mitcham Common, Morden Hall Park
which have specific stoppers to guide to the right
place.

Only allowed to make a park report on a park or open
space on the layer for responsible parks.

Exceptional park Commons Extension Sports Ground is
in Kingston, but is responsibility of Merton so
can be selected from Merton Cobrand.

And Cypress tests

https://github.com/mysociety/societyworks/issues/4643
https://mysocietysupport.freshdesk.com/a/tickets/3934

Server config in same branch on servers

[skip changelog]

[codecov]

Codecov Report

Attention: Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.44%. Comparing base (6bc48d9) to head (5b9c962).

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/Cobrand/Merton.pm	93.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5294      +/-   ##
==========================================
+ Coverage   82.42%   82.44%   +0.01%     
==========================================
  Files         415      415              
  Lines       32862    32896      +34     
  Branches     5272     5275       +3     
==========================================
+ Hits        27087    27120      +33     
  Misses       4218     4218              
- Partials     1557     1558       +1     

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[dracos]

Looking good, and thanks for the tests, but I don't think the out-of-boundary park works on .com, there's nothing to set that up to work (sorry if I missed it!).

[dracos]

Thanks, that should do it :)
Just one name change for clarity