[Entra] Display correct error when creating account not included in configuration

When user group is not included in "Synchronize users only from specified groups" field, logging in will result in error without any information for user.

https://github.com/user-attachments/assets/bbec3b83-bd19-4d1f-9ae6-06f5b1567ad0

We should add appropiate information like we do in similar case with Google.

Start by comparing the Entra login path for users excluded by the configured groups with the similar Google case referenced in the issue. Add equivalent user-facing error information for the excluded-account condition, then verify that login produces the appropriate message instead of an uninformative error.

Written by the indexing model from the issue text.