Use a longer test timeout when debugging with VS code. (#5679)

Author: mstange

.vscode/launch.json

@@ -8,7 +8,7 @@
       "runtimeExecutable": "yarn",
       "runtimeArgs": ["test"],
       "program": "${workspaceFolder}/node_modules/jest/bin/jest",
-      "args": ["--runInBand", "${file}"],
+      "args": ["--runInBand", "--testTimeout=300000", "${file}"],
       "cwd": "${workspaceFolder}",
       "internalConsoleOptions": "openOnSessionStart",
       "request": "launch",