[Upgrade Assistant] Migrate Kibana deprecations flaky integration tests to unit tests#258981

kapral18 merged 4 commits intoelastic:mainelastic/kibana:mainfrom

kapral18:chore/upgrade-assistant/fix-kibana-deprecations-flaky-tests-253915kapral18/kibana:chore/upgrade-assistant/fix-kibana-deprecations-flaky-tests-253915Copy head branch name to clipboard