itest: configure timeout for tapd harness universe courier service

Set the request timeout for the tapd harness universe courier service
to an appropriate value to ensure tests pass consistently.

itest/tapd_harness.go

@@ -257,7 +257,8 @@ func newTapdHarness(t *testing.T, ht *harnessTest, cfg tapdConfig,
 		BackoffCfg:         &hashmailBackoffCfg,
 	}
 	finalCfg.UniverseRpcCourier = &proof.UniverseRpcCourierCfg{
-		BackoffCfg: &universeRpcBackoffCfg,
+		BackoffCfg:            &universeRpcBackoffCfg,
+		ServiceRequestTimeout: 2 * time.Second,
 	}
 
 	switch typedProofCourier := (opts.proofCourier).(type) {