Associating users who does not have login permission about identity-apps

[darshanasbg]

Describe the bug
From the user-portal, we can associate users who do not have login permission. Then when we try to switch to that user, user-portal goes to the logout page.

Expected behavior
The current behavior is somewhat ok, but we can improve the experience in the following ways,

• Do not allow the association of the user accounts which do not have login permission?

Not allowing to associate based on permission is wrong IMO.. We should allow to associate.

• Since the permission later can be removed, during the switch time if the required scopes did not get returned, switch back to the previous account showing a warning message?

If possible, showing the account switch related actions should be disabled. So user don't have a way to try switching to different account in user portal they don't have access.

[thanujalk]

Now there is no permission validation for APIs consumed by User-Portal. So, any user can log in to the User_Portal.