Revert "Use dw dynamic config" (#91846)

Revert "Use dw dynamic config (#91222)"

This reverts commit 0258842f87.

pkg/setting/setting.go

@@ -29,7 +29,6 @@ import (
 	"github.com/grafana/grafana-plugin-sdk-go/backend/gtime"
 
 	"github.com/grafana/grafana/pkg/apimachinery/identity"
-	grafanarest "github.com/grafana/grafana/pkg/apiserver/rest"
 	"github.com/grafana/grafana/pkg/infra/log"
 	"github.com/grafana/grafana/pkg/util"
 	"github.com/grafana/grafana/pkg/util/osutil"
@@ -522,9 +521,6 @@ type Cfg struct {
 
 	//Short Links
 	ShortLinkExpiration int
-
-	// Unified Storage
-	UnifiedStorage map[string]grafanarest.DualWriterMode
 }
 
 type InstallPlugin struct {