Add label to rageshakes for React soft crashes

This adds a label all rageshakes submitted via the React error boundary marking
them as soft crashes for triage.

Fixes https://github.com/vector-im/riot-web/issues/11072

src/components/views/elements/ErrorBoundary.js

@@ -64,7 +64,9 @@ export default class ErrorBoundary extends React.PureComponent {
         if (!BugReportDialog) {
             return;
         }
-        Modal.createTrackedDialog('Bug Report Dialog', '', BugReportDialog, {});
+        Modal.createTrackedDialog('Bug Report Dialog', '', BugReportDialog, {
+            label: 'react-soft-crash',
+        });
     };
 
     render() {