[v11.0.x] CloudMigration: Add service to list all migrations (#86350)

CloudMigration:  Add service to list all migrations (#85308)

(cherry picked from commit 5b147d0847)

Co-authored-by: lean.dev <34773040+leandro-deveikis@users.noreply.github.com>

pkg/services/cloudmigration/model.go

@@ -58,6 +58,10 @@ type CloudMigrationResponse struct {
 	Updated time.Time `json:"updated"`
 }
 
+type CloudMigrationListResponse struct {
+	Migrations []CloudMigrationResponse `json:"migrations"`
+}
+
 type MigrateDatasourcesRequest struct {
 	MigrateToPDC       bool
 	MigrateCredentials bool