PublicDashboards: Add setting to disable the feature (#78894)

* Replace feature toggle with configuration setting

* Fix permission alert

* Update documentation

* Add back feature toggle

* revert unwanted commited changes

* fix tests

* run prettier

* Update SharePublicDashboard.test.tsx

* fix linter and frontend tests

* Update api.go

* Apply docs edit from code review

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

* Update index.md

* Update docs/sources/setup-grafana/configure-grafana/feature-toggles/index.md

Co-authored-by: Agnès Toulet <35176601+AgnesToulet@users.noreply.github.com>

* Update docs/sources/setup-grafana/configure-grafana/_index.md

Co-authored-by: Agnès Toulet <35176601+AgnesToulet@users.noreply.github.com>

* add isPublicDashboardsEnabled + test

* fix test

* update ff description in registry

* move isPublicDashboardsEnabled

* revert getConfig() update

---------

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

pkg/services/featuremgmt/registry.go

@@ -48,7 +48,7 @@ var (
 		},
 		{
 			Name:           "publicDashboards",
-			Description:    "Enables public access to dashboards",
+			Description:    "[Deprecated] Public dashboards are now enabled by default; to disable them, use the configuration setting. This feature toggle will be removed in the next major version.",
 			Stage:          FeatureStageGeneralAvailability,
 			Owner:          grafanaSharingSquad,
 			Expression:     "true", // enabled by default

pkg/services/featuremgmt/toggles_gen.go

@@ -24,7 +24,7 @@ const (
 	FlagPanelTitleSearch = "panelTitleSearch"
 
 	// FlagPublicDashboards
-	// Enables public access to dashboards
+	// [Deprecated] Public dashboards are now enabled by default; to disable them, use the configuration setting. This feature toggle will be removed in the next major version.
 	FlagPublicDashboards = "publicDashboards"
 
 	// FlagPublicDashboardsEmailSharing