add go mod vendor before make e2e-test (#65593)

Author: aabughosh

ci-operator/step-registry/network-flow-matrix/tests/network-flow-matrix-tests-commands.sh

@@ -70,6 +70,7 @@ if version_greater_than "$cluster_version" "$KREW_REQUIRED_VERSION_THRESHOLD"; t
   rm -rf "${SHARED_DIR}/krew"
 fi
 
+go mod vendor
 PATH="/tmp/bin:$PATH" EXTRA_NFTABLES_MASTER_FILE="${ADDITIONAL_NFTABLES_RULES_FILE_PATH}" EXTRA_NFTABLES_WORKER_FILE="${ADDITIONAL_NFTABLES_RULES_FILE_PATH}" SUITE="${SUITE}" \
 OPEN_PORTS_TO_IGNORE_IN_DOC_TEST_FILE="${OPEN_PORTS_TO_IGNORE_IN_DOC_TEST_FILE}" OPEN_PORTS_TO_IGNORE_IN_DOC_TEST_FORMAT="${OPEN_PORTS_TO_IGNORE_IN_DOC_TEST_FORMAT}" make e2e-test
 popd || exit