Alerting: Alert Rule migration (#33000)

* Not complete, put migration behind env flag for now:
UALERT_MIG=iDidBackup
* Important to backup, and not expect the same DB to keep working until the env trigger is removed.
* Alerting: Migrate dashboard alert permissions
* Do not use imported models
* Change folder titles

Co-authored-by: Sofia Papagiannaki <papagian@users.noreply.github.com>

pkg/services/sqlstore/migrations/ualert/datasource.go

@@ -0,0 +1,25 @@
+package ualert
+
+// slurpDSIDs returns a map of [orgID, dataSourceId] -> [UID, Name].
+func (m *migration) slurpDSIDs() (map[[2]int64][2]string, error) {
+	dsIDs := []struct {
+		OrgID int64  `xorm:"org_id"`
+		ID    int64  `xorm:"id"`
+		UID   string `xorm:"uid"`
+		Name  string
+	}{}
+
+	err := m.sess.SQL(`SELECT org_id, id, uid, name FROM data_source`).Find(&dsIDs)
+
+	if err != nil {
+		return nil, err
+	}
+
+	idToUID := make(map[[2]int64][2]string, len(dsIDs))
+
+	for _, ds := range dsIDs {
+		idToUID[[2]int64{ds.OrgID, ds.ID}] = [2]string{ds.UID, ds.Name}
+	}
+
+	return idToUID, nil
+}