CloudMigrations: Query Grafana Migration Status for status while the snapshot is in the cloud (#90314)

* implement querying gms for snapshot status

* add some documentation

* provide snapshot resources after snapshot is created

* add rate limiting to backend

* fix compilation error

* fix typo

* add unit tests

* finish merge

* lint

* swagger gen

* more testing

* remove duplicate test

* address a couple PR comments

* update switch statement to a map

* add timeouts to gms client through the http client

* remove extra whitespace

* put method back where it was so the PR is less confusing

* fix tests

* add todo

* fix final unit test

pkg/services/cloudmigration/cloudmigrationimpl/snapshot_mgmt.go

@@ -190,6 +190,7 @@ func (s *Service) buildSnapshot(ctx context.Context, signedInUser *user.SignedIn
 		return fmt.Errorf("fetching migration data: %w", err)
 	}
 
+	localSnapshotResource := make([]cloudmigration.CloudMigrationResource, len(migrationData.Items))
 	resourcesGroupedByType := make(map[cloudmigration.MigrateDataType][]snapshot.MigrateDataRequestItemDTO, 0)
 	for _, item := range migrationData.Items {
 		resourcesGroupedByType[item.Type] = append(resourcesGroupedByType[item.Type], snapshot.MigrateDataRequestItemDTO{
@@ -198,6 +199,11 @@ func (s *Service) buildSnapshot(ctx context.Context, signedInUser *user.SignedIn
 			Name:  item.Name,
 			Data:  item.Data,
 		})
+		localSnapshotResource = append(localSnapshotResource, cloudmigration.CloudMigrationResource{
+			Type:   item.Type,
+			RefID:  item.RefID,
+			Status: cloudmigration.ItemStatusPending,
+		})
 	}
 
 	for _, resourceType := range []cloudmigration.MigrateDataType{
@@ -222,8 +228,9 @@ func (s *Service) buildSnapshot(ctx context.Context, signedInUser *user.SignedIn
 	// update snapshot status to pending upload with retry
 	if err := retryer.Retry(func() (retryer.RetrySignal, error) {
 		err := s.store.UpdateSnapshot(ctx, cloudmigration.UpdateSnapshotCmd{
-			UID:    snapshotMeta.UID,
-			Status: cloudmigration.SnapshotStatusPendingUpload,
+			UID:       snapshotMeta.UID,
+			Status:    cloudmigration.SnapshotStatusPendingUpload,
+			Resources: localSnapshotResource,
 		})
 		return retryer.FuncComplete, err
 	}, 10, time.Millisecond*100, time.Second*10); err != nil {