[build] Temporarily disable RBE result uploads (#36918)

See b/343253646 for context.

Closes #36918

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36918 from drfloob:disable-resultstore 01a76f396a
PiperOrigin-RevId: 643105120

tools/remote_build/include/rbe_base_config.bazelrc

@@ -37,10 +37,11 @@ build --remote_cache=grpcs://remotebuildexecution.googleapis.com
 
 # Set flags for uploading to BES in order to view results in the Bazel Build
 # Results UI.
-build --bes_backend=grpcs://buildeventservice.googleapis.com
-build --bes_timeout=600s
-build --bes_results_url="https://source.cloud.google.com/results/invocations/"
-build --bes_instance_name=grpc-testing
+# TODO(b/343253646): Uncomment these when the ResultStore backend is fixed
+# build --bes_backend=grpcs://buildeventservice.googleapis.com
+# build --bes_timeout=600s
+# build --bes_results_url="https://source.cloud.google.com/results/invocations/"
+# build --bes_instance_name=grpc-testing
 
 # Avoid timeouts for actions that don't write output for long time (See b/143346671 and b/143134296)
 build --grpc_keepalive_time=10m