Snapshots: Store dashboard data encrypted in the database (#28129)

* end 2 end

* fix import

* refactor

* introduce securedata

* check err

* use testify instead of convey

* cleanup test

* cleanup test

* blob time

* rename funcs

pkg/services/sqlstore/migrations/dashboard_snapshot_mig.go

@@ -64,4 +64,8 @@ func addDashboardSnapshotMigrations(mg *Migrator) {
 	mg.AddMigration("Add column external_delete_url to dashboard_snapshots table", NewAddColumnMigration(snapshotV5, &Column{
 		Name: "external_delete_url", Type: DB_NVarchar, Length: 255, Nullable: true,
 	}))
+
+	mg.AddMigration("Add encrypted dashboard json column", NewAddColumnMigration(snapshotV5, &Column{
+		Name: "dashboard_encrypted", Type: DB_Blob, Nullable: true,
+	}))
 }