Feature/enhance user import

[rockingrohit9639]

Closes #1615

[DonKoko]

• Errors don't seem to be displayed correctly. For example i tried importing a user who's email is an SSO enabled domain. The error in the logs is correct:

{"level":50,"time":1740485806192,"pid":18489,"hostname":"Nikolays-MacBook.local","err":{"cause":{"cause":null,"label":"Invite","shouldBeCaptured":false,"status":400,"traceId":"o7lky0epelweqnlnx1yf3ce2","name":"ShelfError","message":"This email domain uses SSO authentication. The user needs to sign up via SSO before they can be invited.","stack":"ShelfError: This email domain uses SSO authentication. The user needs to sign up via SSO before they can be invited.

But in the view i see this:

We need to make sure the correct error message is shown.

• Same issue when the teamMemberID is invalid. It just says "Something went wrong"
• When the emails were valid, teamMembers were created even tho the import failed. This should not be the case.