* Chore: add setting to skip org assignment for external users
Introduce 'skip_org_role_update_sync' setting to skip any kind of org assignment during the login of external users.
As a consequence manual organization assignments won't be overridden during the upsert of an external user.
Part of #22605
* Chore: Rename skip_org_role_update_sync to oauth_skip_org_role_update_sync and relocate it to auth section
* Chore: replace global setting access where possible