test(e2e): bound Google Chat fixture subprocess

Signed-off-by: San Dang <sdang@nvidia.com>

Author: sandl99

test/e2e/support/channels-stop-start-googlechat.test.ts

@@ -48,6 +48,7 @@ describe("channels stop/start Google Chat live composition", () => {
           NODE_NO_WARNINGS: "1",
         },
         timeout: 10_000,
+        killSignal: "SIGKILL",
       },
     );