[Bexley] Spot open container requests

[dracos]

Checking I've got the right idea. Fixes https://github.com/mysociety/societyworks/issues/4571

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.43%. Comparing base (0047b49) to head (903aff9).
Report is 7 commits behind head on bexley-ww-container-requests.

Additional details and impacted files

@@                      Coverage Diff                      @@
##           bexley-ww-container-requests    #5236   +/-   ##
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  Coverage                         82.42%   82.43%           
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  Files                               410      410           
  Lines                             32147    32165   +18     
  Branches                           5130     5133    +3     
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+ Hits                              26498    26515   +17     
- Misses                             4140     4141    +1     
  Partials                           1509     1509           

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[nephila-nacrea]

I think this is on the right track.
As I understand it, we ought to be doing separate checks for open delivery vs open removal reports.
That does make it more complicated though; I don't know if this will do as a first attempt to show Bexley. (Also, I didn't realise it would be touching the form code and I am still getting my removals PR in place). We could always refine later.

FYI there's a bug that means if any wheelie bin has an open request, all wheelie bins are disabled (I think it's the bug I fix in 8e58de9, but you may want to double-check that).

[dracos]

"As I understand it, we ought to be doing separate checks for open delivery vs open removal reports." - sorry, I didn't follow this bit. The tech spec says if there's an open collect/deliver then both request and removal should be disabled, I think?