execute: validate that RTD can connect to grpc services

BUG=chromium:1149702
TEST=local runs

Change-Id: Iae89b5a48646aebec3f935d721684995e58f0f00
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/tnull/+/2570326
Tested-by: Sean Abraham <[email protected]>
Reviewed-by: Prathmesh Prabhu <[email protected]>
Commit-Queue: Prathmesh Prabhu <[email protected]>
Auto-Submit: Sean Abraham <[email protected]>
1 file changed