Bug 2041810 - populate conflict_slug on mobile

[moibra05]

Added a proper value for conflict_slug when constructing the EnrollmentStatusExtraDef taken by pulling out the actual feature slug which caused the conflict

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[freshstrangemusic]

All changes to types that are serialized to the database require tests and (in this case) a migration

[freshstrangemusic]

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There is a typo in your PR title: config_slug vs conflict_slug

The pull request has been modified, dismissing previous reviews.