Remove Piwik support (#8835)

* Remove all mentions of Piwik

* Kill off all consumer of the old Piwik Analytics module

* Simplify ModalManager interface

* i18n

* Attempt to fix old e2e tests

* Remove unused component

* Iterate PR

src/stores/ModalWidgetStore.ts

@@ -59,7 +59,7 @@ export class ModalWidgetStore extends AsyncStoreWithClient<IState> {
         if (this.modalInstance) return;
         this.openSourceWidgetId = sourceWidget.id;
         this.openSourceWidgetRoomId = widgetRoomId;
-        this.modalInstance = Modal.createTrackedDialog('Modal Widget', '', ModalWidgetDialog, {
+        this.modalInstance = Modal.createDialog(ModalWidgetDialog, {
             widgetDefinition: { ...requestData },
             widgetRoomId,
             sourceWidgetId: sourceWidget.id,