Add "delete submission" option

[rfontanarosa]

closes #2560

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

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.33333% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.70%. Comparing base (4aea145) to head (5b33c3f).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...nel/submission-panel/submission-panel.component.ts	87.50%	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%   62.70%   +0.12%     
==========================================
  Files         119      119              
  Lines        2878     2896      +18     
  Branches      432      434       +2     
==========================================
+ Hits         1801     1816      +15     
- Misses       1015     1018       +3     
  Partials       62       62              

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