Structure the BK pipeline output for failures (#3359)

Author: alexsapran

.buildkite/pipeline.yml

@@ -40,3 +40,12 @@ steps:
     agents:
       provider: "gcp"
       machineType: "n1-standard-8"
+
+  - wait: ~
+    continue_on_failure: true
+  - label: "Processing test results"
+    agents:
+      provider: "gcp"
+    plugins:
+      - junit-annotate#v2.4.1:
+          artifacts: build/TEST-go-*.xml

.buildkite/scripts/steps/integration_tests.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -euxo pipefail
+set -euo pipefail
 
 source .buildkite/scripts/common.sh