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/fake/cloudmigration_fake.go

@@ -137,7 +137,7 @@ func (m FakeServiceImpl) CreateSnapshot(ctx context.Context, user *user.SignedIn
 	return &cloudmigration.CloudMigrationSnapshot{
 		UID:        "fake_uid",
 		SessionUID: sessionUid,
-		Status:     cloudmigration.SnapshotStatusUnknown,
+		Status:     cloudmigration.SnapshotStatusCreating,
 	}, nil
 }
 
@@ -148,7 +148,7 @@ func (m FakeServiceImpl) GetSnapshot(ctx context.Context, query cloudmigration.G
 	return &cloudmigration.CloudMigrationSnapshot{
 		UID:        "fake_uid",
 		SessionUID: "fake_uid",
-		Status:     cloudmigration.SnapshotStatusUnknown,
+		Status:     cloudmigration.SnapshotStatusCreating,
 	}, nil
 }
 
@@ -160,12 +160,12 @@ func (m FakeServiceImpl) GetSnapshotList(ctx context.Context, query cloudmigrati
 		{
 			UID:        "fake_uid",
 			SessionUID: query.SessionUID,
-			Status:     cloudmigration.SnapshotStatusUnknown,
+			Status:     cloudmigration.SnapshotStatusCreating,
 		},
 		{
 			UID:        "fake_uid",
 			SessionUID: query.SessionUID,
-			Status:     cloudmigration.SnapshotStatusUnknown,
+			Status:     cloudmigration.SnapshotStatusCreating,
 		},
 	}, nil
 }