Remove unused variable and dualwrite reference in provisioning code

- Eliminated an unused variable declaration in `provisioning_manifest.go`.
- Removed the `nil` reference for dualwrite in `repo_operator.go`, aligning with the standalone operator's assumption of unified storage.

apps/provisioning/pkg/apis/manifestdata/provisioning_manifest.go

@@ -14,8 +14,6 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
-var ()
-
 var appManifestData = app.ManifestData{
 	AppName:          "provisioning",
 	Group:            "provisioning.grafana.app",

pkg/operators/provisioning/repo_operator.go

@@ -85,7 +85,6 @@ func RunRepoController(deps server.OperatorDependencies) error {
 		resourceLister,
 		controllerCfg.clients,
 		jobs,
-		nil, // dualwrite -- standalone operator assumes it is backed by unified storage
 		healthChecker,
 		statusPatcher,
 		deps.Registerer,