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>

packages/grafana-data/src/types/config.ts

@@ -148,6 +148,7 @@ export interface BootData {
  */
 export interface GrafanaConfig {
   publicDashboardAccessToken?: string;
+  publicDashboardsEnabled: boolean;
   snapshotEnabled: boolean;
   datasources: { [str: string]: DataSourceInstanceSettings };
   panels: { [key: string]: PanelPluginMeta };

packages/grafana-runtime/src/config.ts

@@ -36,6 +36,7 @@ export type AppPluginConfig = {
 
 export class GrafanaBootConfig implements GrafanaConfig {
   publicDashboardAccessToken?: string;
+  publicDashboardsEnabled = true;
   snapshotEnabled = true;
   datasources: { [str: string]: DataSourceInstanceSettings } = {};
   panels: { [key: string]: PanelPluginMeta } = {};