xDS interop: enable pod log collection in the buildscripts

- Enables pod log collection in all PSM interop jobs implemented
  in https://github.com/grpc/grpc/pull/30594.
- Associate test suite runs with their own log file, so it's displayed
  on the "Target Log" tab
- Adds missing `--force_cleanup` to the lb test (reduces leaked
  resources)
- Fix run_test not returning correct exit status, causing false
  positives in some cases. See https://github.com/grpc/grpc/pull/30768

packages/grpc-js-xds/scripts/xds_k8s_lb.sh

@@ -98,6 +98,8 @@ run_test() {
   # Test driver usage:
   # https://github.com/grpc/grpc/tree/master/tools/run_tests/xds_k8s_test_driver#basic-usage
   local test_name="${1:?Usage: run_test test_name}"
+  local out_dir="${TEST_XML_OUTPUT_DIR}/${test_name}"
+  mkdir -pv "${out_dir}"
   # testing_version is used by the framework to determine the supported PSM
   # features. It's captured from Kokoro job name of the Node repo, which takes
   # the form:
@@ -109,7 +111,11 @@ run_test() {
     --client_image="${CLIENT_IMAGE_NAME}:${GIT_COMMIT}" \
     --server_image="${SERVER_IMAGE_NAME}" \
     --testing_version="${TESTING_VERSION}" \
-    --xml_output_file="${TEST_XML_OUTPUT_DIR}/${test_name}/sponge_log.xml"
+    --force_cleanup \
+    --collect_app_logs \
+    --log_dir="${out_dir}" \
+    --xml_output_file="${out_dir}/sponge_log.xml" \
+    |& tee "${out_dir}/sponge_log.log"
 }
 
 #######################################

packages/grpc-js-xds/scripts/xds_k8s_url_map.sh

@@ -98,15 +98,19 @@ run_test() {
   # Test driver usage:
   # https://github.com/grpc/grpc/tree/master/tools/run_tests/xds_k8s_test_driver#basic-usage
   local test_name="${1:?Usage: run_test test_name}"
+  local out_dir="${TEST_XML_OUTPUT_DIR}/${test_name}"
+  mkdir -pv "${out_dir}"
   set -x
   python3 -m "tests.${test_name}" \
     --flagfile="${TEST_DRIVER_FLAGFILE}" \
+    --flagfile="config/url-map.cfg" \
     --kube_context="${KUBE_CONTEXT}" \
     --client_image="${CLIENT_IMAGE_NAME}:${GIT_COMMIT}" \
     --testing_version="${TESTING_VERSION}" \
-    --xml_output_file="${TEST_XML_OUTPUT_DIR}/${test_name}/sponge_log.xml" \
-    --flagfile="config/url-map.cfg"
-  set +x
+    --collect_app_logs \
+    --log_dir="${out_dir}" \
+    --xml_output_file="${out_dir}/sponge_log.xml" \
+    |& tee "${out_dir}/sponge_log.log"
 }
 
 #######################################

test/kokoro/xds_k8s_lb.cfg

@@ -20,7 +20,7 @@ timeout_mins: 180
 action {
   define_artifacts {
     regex: "artifacts/**/*sponge_log.xml"
-    regex: "artifacts/**/*sponge_log.log"
+    regex: "artifacts/**/*.log"
     strip_prefix: "artifacts"
   }
 }

test/kokoro/xds_k8s_url_map.cfg

@@ -20,7 +20,7 @@ timeout_mins: 180
 action {
   define_artifacts {
     regex: "artifacts/**/*sponge_log.xml"
-    regex: "artifacts/**/*sponge_log.log"
+    regex: "artifacts/**/*.log"
     strip_prefix: "artifacts"
   }
 }