feat: allow editing of submission by the user

[Chartman123]

This fixes #1110 and #1656 and is a follow-up on #1690 by @tpokorra

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 37 lines in your changes missing coverage. Please review.

Project coverage is 44.49%. Comparing base (c040863) to head (de7971b).
Report is 21 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2715      +/-   ##
============================================
+ Coverage     43.93%   44.49%   +0.55%     
- Complexity      941      974      +33     
============================================
  Files            78       79       +1     
  Lines          3428     3531     +103     
============================================
+ Hits           1506     1571      +65     
- Misses         1922     1960      +38     

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[Chartman123]

@tpokorra I'm now in a state for testing. Would be nice if you can also give it a try.

We changed some things:

• We decided that every user can generally see his own submissions.
• The allowEdit switch in the sidebar toggles the ability to edit/delete your own submissions.
• submitMultiple is no longer disabled when allowEdit is set: As we now have the UI to show all own submissions, the user can go to the Results view and there to the Responses subview and choose from the action menu next to the submission which submission he wants to edit/delete. You're then redirected to the submit view with the additional url parameter /{submissionId}.
• The mapping answer -> question happens in the frontend now, so that the GET submissions/{submissionId} endpoint doesn't need to know for which purpose the submission is requested.