Add self service user/organisation deletion

[tudddorrr]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.39%. Comparing base (8bd2b20) to head (d9e62ba).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1039      +/-   ##
===========================================
+ Coverage    98.37%   98.39%   +0.01%     
===========================================
  Files          464      466       +2     
  Lines         7383     7461      +78     
  Branches       982      984       +2     
===========================================
+ Hits          7263     7341      +78     
  Misses          49       49              
  Partials        71       71              

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