Remove various unused CI tables and column
What does this MR do?
Remove following:
Tables
- ci_application_settings
- ci_events
- ci_jobs
- ci_sessions
- ci_taggings
- ci_tags
Columns
- ci_commits.push_data
- ci_builds.job_id
- ci_builds.deploy
What are the relevant issue numbers?
Closes #28869 (closed)