Add "delete submission" for survey organizers

[rfontanarosa]

closes #2560

Registrazione.schermo.2026-07-17.alle.19.29.14.mov

[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.79%. Comparing base (4aea145) to head (96adcb6).

Files with missing lines	Patch %	Lines
...nel/submission-panel/submission-panel.component.ts	91.30%	2 Missing ⚠️
.../src/app/services/submission/submission.service.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2564      +/-   ##
==========================================
+ Coverage   62.57%   62.79%   +0.21%     
==========================================
  Files         119      119              
  Lines        2878     2903      +25     
  Branches      432      436       +4     
==========================================
+ Hits         1801     1823      +22     
- Misses       1015     1018       +3     
  Partials       62       62              

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