bump relay integration test timeout from 3s to 10s (#1072)
Trying to reduce the frequency of flakey test failures in github actions
CI. Suspect this is due to over-utilized test runners.
This should not impact "happy path" (tests passing), but makes working
on the tests a bit annoying. Might be possible to check env vars to see
if the test is running in CI and have a different timeout for that
situation.