IONOS(NewUserDialog): update group selection to prevent admin group from being assigned as subadmin

[Arsalanulhaq]

This pull request updates the user creation dialog to prevent assigning the "admin" group as a sub-admin group, improving group management logic and user experience.

User group selection improvements:

• The group selection dropdown for sub-admin assignment now uses the new availableSubAdminGroups computed property, which filters out the "admin" group so it cannot be assigned as a sub-admin group.
• Added the availableSubAdminGroups computed property to exclude the "admin" group from the list of available groups for sub-admin assignment.

Related:

• (merged) NC PR fix(NewUserDialog): update group selection to prevent admin group from being assigned as subadmin nextcloud/server#57233
  • stable31 PR [stable31] fix(NewUserDialog): update group selection to prevent admin group from being assigned as subadmin nextcloud/server#57294

TODO

• review/merge IONOS(config): update submodule 3d870c6 (build: enable Nextcloud core build for npm changes) #162

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[Copilot]

Pull request overview

This PR prevents the "admin" group from being assigned as a sub-admin group during user creation, addressing a logical inconsistency in group management. The change ensures that when creating a new user, the "Set account as admin for..." dropdown only displays groups that are valid for sub-admin assignment.

Key changes:

• Added a new computed property availableSubAdminGroups that filters out the "admin" group from the available groups list
• Updated the sub-admin group selection dropdown to use the new filtered list instead of all available groups