Auth Providers: Add search_using_service_account field

[rak-phillip]

Add the ability to configure searchUsingServiceAccount while creating and editing openldap and freeipa auth providers.

Acceptance criteria

• searchUsingServiceAccount is able to be configured for openldap and freeipa auth providers
• searchUsingServiceAccount is a boolean with a default value of false

Notes

• The new searchUsingServiceAccount setting is located under /v3/authconfigs
• searchUsingServiceAccount applies only to freeipa an openldap providers
• shell/edit/auth/ldap/config.vue is most likely the component that will receive this change
• The save method appears to be defined in shell/mixins/auth-config.js

Details

This feature request is related to rancher/rancher#43064.

Rancher currently scopes searches to the permissions of the requesting user to prevent permission escalation. This approach doesn't support typical setups where users have no permissions in the authentication provider, and a service account is used to control read permissions. Adding search_using_service_account allows users who use the more typical setups to use Rancher in the method that they desire.

[cnotv]

While setting up the auth provider I got this message and confused me a lot.

[cnotv]

Also this icon not sure what means here

[cnotv]

To add context, the search which needs to be enabled with the checkbox/toggler is inside the Cluster Membership configuration.
Here an example like in GitHub when searching an user to add:

[yonasberhe23]

Manual validation is required. While the related unit test verifies the existence of the configuration, we should perform regression testing around FreeIPA and OpenLDAP auth providers (e.g. ensure the configuration is correctly passed in the request payload).

[cnotv]

Yeah, I am trying to debug #12477 and we do not have a single (unit) test in the whole auth provider configuration CRUD process.
It's a good idea to check if existing logic is still working, beside I did not touch the code, so it should be not affected.