Plugins: Display plugin permissions required (#78355)

* Add definition of external service registration

* Add style and tables for permissions needed

* Add external service registration to local without counterpart

* Add feature toggle check

* Add feature flag check in the backend as well

* Add the disclaimer for permissions

---------

Co-authored-by: Gabriel MABILLE <gabriel.mabille@grafana.com>

pkg/api/plugins.go

@@ -144,6 +144,10 @@ func (hs *HTTPServer) GetPluginList(c *contextmodel.ReqContext) response.Respons
 			AngularDetected: pluginDef.Angular.Detected,
 		}
 
+		if hs.Features.IsEnabled(c.Req.Context(), featuremgmt.FlagExternalServiceAccounts) {
+			listItem.IAM = pluginDef.IAM
+		}
+
 		update, exists := hs.pluginsUpdateChecker.HasUpdate(c.Req.Context(), pluginDef.ID)
 		if exists {
 			listItem.LatestVersion = update