Restructure cloudmigration service (#83211)

* Restructure cloudmigation service

* Adjust codewoners and wire

* Comment out unused metrics

pkg/services/cloudmigration/cloudmigrationimpl/xorm_store_test.go

@@ -0,0 +1,9 @@
+package cloudmigrationimpl
+
+import (
+	"testing"
+)
+
+func TestMigrateDatasources(t *testing.T) {
+	// TODO: Write this test
+}