[PM-19143] Fix custom permissions not persisting via InviteOrganizationUsersCommand

[r-tome]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-19143

📔 Objective

MapToDataModel was not calling SetPermissions() on the OrganizationUser entity, so custom permissions were never written to the database when inviting through POST /public/members with the feature flag enabled. Adds the missing call and strengthens the integration test to cover permissions.

[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

[github-actions]

Checkmarx One – Scan Summary & Details – 0455d850-30ea-4007-a0e5-fbbca544efa4

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.85%. Comparing base (524c545) to head (47b2ca5).
⚠️ Report is 139 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7285   +/-   ##
=======================================
  Coverage   57.84%   57.85%           
=======================================
  Files        2043     2043           
  Lines       89868    89875    +7     
  Branches     7989     7990    +1     
=======================================
+ Hits        51984    51993    +9     
+ Misses      36025    36024    -1     
+ Partials     1859     1858    -1     

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