Alerting: Update migration to put alerts to the default folder if dashboard folder is missing (#65577)
* extract function
* use context logger
* put alert to general folder if folder is missing
* move folderHelper init
* add test
* Update pkg/services/sqlstore/migrations/ualert/ualert.go
Co-authored-by: Matthew Jacobson <matthew.jacobson@grafana.com>
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Co-authored-by: Matthew Jacobson <matthew.jacobson@grafana.com>
(cherry picked from commit 7b2f44762e)
# Conflicts:
# pkg/services/sqlstore/migrations/ualert/migration_test.go
# pkg/services/sqlstore/migrations/ualert/ualert.go
f23efb1bbd