[FMS] Expand options on editing updates

[MorayMySoc]

Adds more detail to the editing of updates on FMS

https://github.com/mysociety/fixmystreet/issues/3907

[skip changelog]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.78%. Comparing base (c8c98c7) to head (ff50439).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4306      +/-   ##
==========================================
+ Coverage   82.75%   82.78%   +0.02%     
==========================================
  Files         391      391              
  Lines       30563    30576      +13     
  Branches     4832     4832              
==========================================
+ Hits        25293    25312      +19     
+ Misses       3822     3816       -6     
  Partials     1448     1448              

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[MorayMySoc]

This is still lacking the check on whether the update changed the status mentioned in the ticket, but PR as could be good to have the other features available.

[MorayMySoc]

@dracos This was the briefly mentioned old PR review. Tests were failing for a long time. The ticket wasn't 100% finished but was asked to PR what was there.