[Feature] Option to treat accounts as managed by the OAuth provider

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature Many instances use OAuth as the only way to log in, with password login disabled. In that setup the identity provider is where users actually manage their account, but Immich's user settings still behave as if accounts were local: • The Password section is always shown, even though the password there is not the one the user logs in with. Users try to change their password there and are confused when nothing changes at their provider. • The Unlink OAuth button is always shown. With password login disabled, unlinking leaves the user unable to log in at all (see #5112, which this request would cover). • Since v3.3.0, quota, role and username can be synced from claims on every login, so the provider is already the source of truth for parts of the account. Local edits to these get overwritten on the next login. Proposal: an a…