feat: inject unified data migrations in dual writer (#114138)

* feat: draft changes for on-prem unified migration

* feat: further draft changes for on-prem unified migration

* fix: remove some tbis

* refactor: rename

* fix: another approach

* fix: background service related issues

* fix: address comments

* fix: make gen-go

* fix: background service related issues

* feat: refactor dual writer and legacy migrator

* fix: minor issues

* feat: working version in oss

* fix: wire

* fix: revert test data override

* fix: enterprise related issues

* chore: add todo

* fix: revert dual writer method

* fix: lint

* chore: logger format

* fix: reduce log level

* fix: log change

* fix: disable

* fix: address comments

* fix: return error on dual writer service

* fix: merge conflict

---------

Co-authored-by: Rafael Paulovic <rafael.paulovic@grafana.com>

pkg/services/apiserver/builder/helper.go

@@ -379,7 +379,7 @@ func InstallAPIs(
 			case grafanarest.Mode4, grafanarest.Mode5:
 				return storage, nil
 			default:
-				return dualwrite.NewDualWriter(gr, currentMode, legacy, storage)
+				return dualwrite.NewStaticStorage(gr, currentMode, legacy, storage)
 			}
 		}
 	}