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* Alerting: Add integration test for AddDashAlertMigration * Add more targeted test cases * Apply suggestions from code review Co-authored-by: gotjosh <josue.abreu@gmail.com> * Reorganize file and improve comments * Replace custom sort+trim with go-cmp * Add test for AddDashAlertMigration * Rename test cases to standard format * Apply suggestions from code review Co-authored-by: gotjosh <josue.abreu@gmail.com> * Remove test-only snapshots of PostableUserConfig et al. * Organize imports * Fix linting Co-authored-by: gotjosh <josue.abreu@gmail.com>