[backend/frontend] User deletion and Public sharing - Chunk D (#14918)

[ludovic]

Proposed changes

*This chunk handles cleaning up public configs when a user is deleted and fixes UX issues in the edition forms.

Backend

• Cleanup on user deletion: Added disablePublicSharingForDeletedUser inside userDelete. It automatically sets *_public = false (and stream_live = false) on any Feed, TAXII, or Stream using the deleted user, and clears *_public_user_id.
• Fix "System" UI display: *_public_user resolvers now properly return null instead of falling back to SYSTEM_USER when *_public_user_id is empty.
• Edition validation: Backend now strictly rejects passing *_public = true during fieldPatch mutations if no *_public_user_id is defined.

Frontend

• Controlled Public Switch: Stream and TAXII edition forms now use controlled Formik state for the public switch.
• Batched Save on Enable: Toggling public ON merely shows the user selector. Selecting a user then triggers a single mutation sending both *_public_user_id and *_public = true.
• Immediate Save on Disable: Toggling OFF disables public sharing immediately.
• Delete Warning: Added an alert in UserDeletionDialog.tsx warning that associated public feeds and streams will be disabled.

Related issues

• Fixed Improve data sharing in public mode #14918

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

❌ Patch coverage is 58.33333% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.77%. Comparing base (dfc3754) to head (b5a2439).

Files with missing lines	Patch %	Lines
...components/data/stream/StreamCollectionEdition.tsx	0.00%	12 Missing ⚠️
...e/components/data/taxii/TaxiiCollectionEdition.tsx	0.00%	12 Missing ⚠️
...src/modules/dataSharing/streamCollection-domain.ts	37.50%	5 Missing ⚠️
.../src/modules/dataSharing/taxiiCollection-domain.ts	37.50%	5 Missing ⚠️
...aphql/src/modules/dataSharing/dataSharing-utils.ts	97.43%	1 Missing ⚠️

Additional details and impacted files

@@                        Coverage Diff                        @@
##           feat/public-data-sharing-chunk-c   #15314   +/-   ##
=================================================================
  Coverage                             32.76%   32.77%           
=================================================================
  Files                                  3151     3151           
  Lines                                214042   214114   +72     
  Branches                              38966    38980   +14     
=================================================================
+ Hits                                  70129    70171   +42     
- Misses                               143913   143943   +30     

Flag	Coverage Δ
opencti-client-python	45.59% <ø> (ø)
opencti-front	2.86% <0.00%> (-0.01%)	⬇️
opencti-graphql	68.16% <81.66%> (+<0.01%)	⬆️

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