Resolves #12541

@gizemmutukurt Could you test it?

Expectation:
Admin should login with tenant with user name.

Happy path: if user is exists, user have been login with the user on tenanat.
Other case : when the user is not exits, The error appear on the screen. (Error message will be more accurate in the future, there is a issue about that. Error message come from backend/Openiddict)

Steps

• test with tenant user that name is admin
• test with tenant user that name is different from admin.
• test with tenant user that not exists.

note: Modal is small on angular but MVC version has large modal. I asked Armagan, he said "small size is better for this case"

7.1.0 22 March, 2023 pr-revision-0