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/api/dtos.go

@@ -224,14 +224,13 @@ const (
 	SnapshotStatusPendingProcessing SnapshotStatus = "PENDING_PROCESSING"
 	SnapshotStatusProcessing        SnapshotStatus = "PROCESSING"
 	SnapshotStatusFinished          SnapshotStatus = "FINISHED"
+	SnapshotStatusCanceled          SnapshotStatus = "CANCELED"
 	SnapshotStatusError             SnapshotStatus = "ERROR"
 	SnapshotStatusUnknown           SnapshotStatus = "UNKNOWN"
 )
 
 func fromSnapshotStatus(status cloudmigration.SnapshotStatus) SnapshotStatus {
 	switch status {
-	case cloudmigration.SnapshotStatusInitializing:
-		return SnapshotStatusInitializing
 	case cloudmigration.SnapshotStatusCreating:
 		return SnapshotStatusCreating
 	case cloudmigration.SnapshotStatusPendingUpload:
@@ -244,6 +243,8 @@ func fromSnapshotStatus(status cloudmigration.SnapshotStatus) SnapshotStatus {
 		return SnapshotStatusProcessing
 	case cloudmigration.SnapshotStatusFinished:
 		return SnapshotStatusFinished
+	case cloudmigration.SnapshotStatusCanceled:
+		return SnapshotStatusCanceled
 	case cloudmigration.SnapshotStatusError:
 		return SnapshotStatusError
 	default: