Auth Providers: Add ability to modify GroupSearchEnabled for Generic OIDC

[rak-phillip]

Add the ability to modify GroupSearchEnabled while creating and editing Generic OIDC auth providers, so that users will have a straightforward way to enable searching for groups via the UI.

Acceptance criteria

• GroupSearchEnabled is able to be modified while creating and modifying Generic OIDC auth providers

Details

When a user configures a Generic OIDC auth provider, he has to log in with the OIDC provider to finish the setup. If the user is not part of any groups then the GroupSearchEnabled is disabled; this can't be updated through the UI, making it impossible to browse for groups, etc.

A workaround exists to update the CR object in the local cluster or to perform the setup again using a user attached to at least a group in the OIDC provider.

SURE-9255