ci: Set timeout for BES/resultstore streaming (envoyproxy#21775)

Signed-off-by: Ryan Northey <ryan@synca.io>

.bazelrc

@@ -322,6 +322,7 @@ build:remote-ci --remote_executor=grpcs://remotebuildexecution.googleapis.com
 # Build Event Service
 build:google-bes --bes_backend=grpcs://buildeventservice.googleapis.com
 build:google-bes --bes_results_url=https://source.cloud.google.com/results/invocations/
+build:google-bes --bes_timeout=5s
 
 # Fuzz builds