Use dw dynamic config (#91882)

* Remove kubernetesPlaylists feature_toggle

* Remove unified_storage_mode

* Remove double import

* Read from config instead from feature_toggle

* cover scenario for when unified storage is not defined

* Be temporarily retro compatible with previous feature toggle

* Properly read unified_storage section

* [WIP] Read new format of config

* Fix test

* Fix other tests

* Generate feature flags file

* Use <group>.<resource> schema

* Use <group>.resource format on the FE as well

* Hide UniStore config from Frontend

Signed-off-by: Maicon Costa <maiconscosta@gmail.com>

* unwanted changes

* Use feature toggles in the FE. Enforce FTs are present before enabling dual writing
Co-authored-by: Ryan McKinley <ryantxu@users.noreply.github.com>

* use kubernetes playlists feature toggle on the FE

* Remove unwanted code

* Remove configs from the FE

* Remove commented code

* Add more explicit example

---------

Signed-off-by: Maicon Costa <maiconscosta@gmail.com>
Co-authored-by: Maicon Costa <maiconscosta@gmail.com>

pkg/setting/setting.go

@@ -29,6 +29,7 @@ import (
 	"github.com/grafana/grafana-plugin-sdk-go/backend/gtime"
 
 	"github.com/grafana/grafana/pkg/apimachinery/identity"
+	"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"
@@ -523,6 +524,13 @@ type Cfg struct {
 
 	//Short Links
 	ShortLinkExpiration int
+
+	// Unified Storage
+	UnifiedStorage map[string]UnifiedStorageConfig
+}
+
+type UnifiedStorageConfig struct {
+	DualWriterMode rest.DualWriterMode
 }
 
 type InstallPlugin struct {
@@ -1324,6 +1332,9 @@ func (cfg *Cfg) parseINIFile(iniFile *ini.File) error {
 	cfg.ScopesListScopesURL = scopesSection.Key("list_scopes_endpoint").MustString("")
 	cfg.ScopesListDashboardsURL = scopesSection.Key("list_dashboards_endpoint").MustString("")
 
+	// read unifed storage config
+	cfg.setUnifiedStorageConfig()
+
 	return nil
 }