Plugins: Catalog force enable via config and remove enterprise plugin options (#34358)

* force enable catalog based on backend config

* update comments

* chore(plugin-catalog): remove config page in favour of backend flag

* docs(plugin-catalog): update readme

Co-authored-by: Jack Westbrook <jack.westbrook@gmail.com>

pkg/plugins/app_plugin.go

@@ -84,6 +84,11 @@ func (app *AppPlugin) InitApp(panels map[string]*PanelPlugin, dataSources map[st
 	cfg *setting.Cfg) []*PluginStaticRoute {
 	staticRoutes := app.InitFrontendPlugin(cfg)
 
+	// force enable bundled catalog app
+	if app.Id == "grafana-plugin-catalog-app" && cfg.CatalogAppEnabled {
+		app.AutoEnabled = true
+	}
+
 	// check if we have child panels
 	for _, panel := range panels {
 		if strings.HasPrefix(panel.PluginDir, app.PluginDir) {