WIP [Bexley][WW] Allow user to request new containers

[nephila-nacrea]

Please check the following:

• 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

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[codecov]

Codecov Report

Attention: Patch coverage is 14.70588% with 29 lines in your changes missing coverage. Please review.

Project coverage is 69.99%. Comparing base (2460d7d) to head (6619f11).
Report is 80 commits behind head on master.

Files with missing lines	Patch %	Lines
perllib/FixMyStreet/Cobrand/Bexley/Waste.pm	10.34%	26 Missing ⚠️
...rllib/FixMyStreet/App/Form/Waste/Request/Bexley.pm	40.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (2460d7d) and HEAD (6619f11). Click for more details.

HEAD has 7 uploads less than BASE

Flag	BASE (2460d7d)	HEAD (6619f11)
	15	8

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5111       +/-   ##
===========================================
- Coverage   82.66%   69.99%   -12.68%     
===========================================
  Files         404      406        +2     
  Lines       31462    34407     +2945     
  Branches     4988     5825      +837     
===========================================
- Hits        26008    24083     -1925     
- Misses       3975     8762     +4787     
- Partials     1479     1562       +83     

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