Improve or remove warning when hiding native login form

[moan0s]

Is your feature request related to a problem? Please describe.

Since #25910 it's possible to disable the native login form. This is a greate feature if you solely rely on SSO to login as users are less confused where to enter their credentials. The problem for me is that the current error message that replaces the form is puzzling for a user as it says: "Please contact your administrator." This is disruptive as the form not being there is expected and there is no reason to contact a system administrator if SSO works as expected.

Describe the solution you'd like

Disable the notecard altogether: As the setting is turned on by the admin there will be a reason behind this (SSO is the only one I can think of) and it is to be assumed that there is no information to the user or action from the user needed.

Describe alternatives you've considered

Replace the text and re-style the notecard so that it does not show a warning. It could use notecard--success or implement something new like notecard--info

This is a trough sketch how it could look like

Additional context

This issue is also outlined here: https://blog.cubieserver.de/2022/complete-guide-to-nextcloud-oidc-authentication-with-authentik/

[szaimen]

Feel free to adjust the wording here: https://github.com/nextcloud/server/edit/master/core/src/views/Login.vue
See

server/core/src/views/Login.vue

Line 100 in 5e96228

{{ t('core', 'Please contact your administrator.') }}

[moan0s]

I made two PRs, one removes the message, one rephrases the warning. I think both solutions would enhance the user experience, so feel free to decide which to use (I have a slight personal preference to a removal).