User mapping - Add active and humans filters to users
requested to merge 471933-user-mapping-fe-only-show-active-human-users-in-actions-dropdown into master
What does this MR do and why?
Change user select dropdown to filter only users who are active and humans so we don't include users that cannot be mapped (as per backend logic and validations).
This change is behind a feature flag importer_user_mapping.
MR acceptance checklist
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Screenshots or screen recordings
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How to set up and validate locally
See !158026 (merged).
Related to #471933 (closed)