Improvements on workflows, documentation and reported security issues by GH Scanning

[graduta]

PR which includes:

• added documentation on clients sending data for LhcFill Entity
• added restrictions on workflows executed on GH Actions
• enhanced restrictions on accepted user input fields for API requests and update on tests
• update of umzug patch dependency

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.74%. Comparing base (4d878a6) to head (b005bb9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1915      +/-   ##
==========================================
- Coverage   45.75%   45.74%   -0.01%     
==========================================
  Files        1007     1007              
  Lines       16653    16653              
  Branches     2983     2983              
==========================================
- Hits         7619     7618       -1     
- Misses       9034     9035       +1     

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