User mapping - Show inline errors for users once CSV is processed

Justin Ho Tuan Duongrequested to merge
473975-user-mapping-show-inline-errors-for-users-once-csv-is-processed into master

What does this MR do and why?

When reassignmentError attribute is sent from backend, we want to show this to the user.

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Screenshots or screen recordings

Before After
User_mapping_reassignment_errors_before User_mapping_reassignment_errors_after

How to set up and validate locally

See !162421 (merged).

Related to #473975 (closed)

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