Add .gz extension to to traces.json

As we are sending a gzipped file. We could make the rageshake server
look for this and gunzip it, but either way this seems like as good a
way as any to signal that the file is gzipped.

src/settings/submit-rageshake.ts

@@ -249,7 +249,7 @@ export function useSubmitRageshake(): {
           body.append(
             "file",
             gzip(ElementCallOpenTelemetry.instance.rageshakeProcessor!.dump()),
-            "traces.json"
+            "traces.json.gz"
           );
 
           if (inspectorState) {