Add logic to wait for pipeline creation

What does this MR do and why?

Attempting to reduce flakiness for browser_ui/4_verify/ci_job_artifacts/unlocking_job_artifacts_across_pipelines_spec.rb by adding logic to wait for new pipeline to be created after every commit to either add or update CI yml file.

See explanation #403190 (comment 1442493084)

Also add after block to remove runner via API.

MR acceptance checklist

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Related to #403190 (closed)