[QUARANTINE] [nightly] Verify Pipeline editor when CI has invalid syntax shows invalid validations

What does this MR do?

Quarantines the test Verify Pipeline editor when CI has invalid syntax shows invalid validations (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/browser_ui/4_verify/pipeline/pipeline_editor_tabs_spec.rb#L86)

This test has been found by Confiner to have failed 3 times, which meets the threshold of 3 times.

1. ee:update
2. ee:airgapped
3. ee:instance-image-slow-network

#390322 (closed)

(This MR was automatically generated by Confiner at 2023-02-04 01:21:15 UTC)