[Ownership] Add quick check to prevent test files from being added wi…

…thout an owner (#201979)

## Summary

Add quick check to prevent test files from being added without an owner

Resolves: #192979

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
Co-authored-by: Robert Oskamp <robert.oskamp@elastic.co>

.buildkite/scripts/steps/checks/quick_checks.txt

@@ -17,3 +17,4 @@
 .buildkite/scripts/steps/checks/prettier_topology.sh
 .buildkite/scripts/steps/checks/renovate.sh
 .buildkite/scripts/steps/checks/native_modules.sh
+.buildkite/scripts/steps/checks/test_files_missing_owner.sh

.buildkite/scripts/steps/checks/test_files_missing_owner.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+source .buildkite/scripts/common/util.sh
+
+echo --- Check for Test Files missing an owner
+node scripts/check_ftr_code_owners