fix: [DHIS2-13020][DHIS2-21871] Preserve WL sharing on update and fix 409 for non-owners

[henrikmv]

This PR fixes two bugs affecting Working List views DHIS2-13020 and DHIS2-21871:

• 409 conflict when a non-owner user with edit access clicks Update view
• Sharing settings silently reset when any user saves changes to a view

Both were caused by sending legacy sharing fields (externalAccess, publicAccess, user, userAccesses, userGroupAccesses) that the backend no longer processes on PUT.

The fix replaces these with the sharing object across all three working list types (Event, TEI, Program Stage).

# API fields query
- fields: '...,externalAccess,publicAccess,
-   user[id,username],userAccesses,
-   userGroupAccesses'
+ fields: '...,sharing'

# Update payload (SharingDialog)
- { externalAccess, publicAccess,
-   userAccesses, userGroupAccesses }
+ { sharing: { owner, public,
+   external, users, userGroups } }

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[devin-ai-integration]

Devin Review found 2 new potential issues.

[github-actions]

🚀 Deployed on https://deploy-preview-4702.capture.netlify.dhis2.org

[simonadomnisoru]

Looks good!