[#4321] Allow max number of submissions per form

[vaszig]

Closes #4321 partly

Changes

• Added fields to Form model in order to track max submissions and the counter
• New tab on the admin page of the form for setting max allowed submissions

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[codecov]

Codecov Report

Attention: Patch coverage is 94.59459% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.58%. Comparing base (3ae753c) to head (a21cc64).
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
src/openforms/submissions/utils.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4885   +/-   ##
=======================================
  Coverage   96.57%   96.58%           
=======================================
  Files         757      757           
  Lines       25728    25783   +55     
  Branches     3379     3390   +11     
=======================================
+ Hits        24847    24902   +55     
  Misses        616      616           
  Partials      265      265           

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[sergei-maertens]

yes :)

[vaszig]

I do not know why test coverage doesn't like the src/openforms/submissions/utils.py#L306 but these lines are covered both for starting and resuming a form.