Add CI builds metadata migration configuration to 18.7 upgrade notes

Marius Bobinrequested to merge
duo-edit-20251127-102708 into master

This MR updates the GitLab 18.7 upgrade notes to document the new configuration options for the CI builds metadata migration introduced in !214248 (merged).

The migration moves CI builds metadata to new tables and provides environment variables to control the migration scope for self-managed instances with large CI datasets.

Documentation added:

  • DATABASE_CI_JOBS_MIGRATION_CUTOFF: Controls which jobs are migrated overall
  • DATABASE_CI_JOBS_PROCESSING_DATA_CUTOFF: Controls when to stop creating job definitions
  • Migration behavior and processing order
  • Impact on different types of CI job data

Related to !214248 (merged) and #579807

Preview page: https://docs.gitlab.com/upstream-review-mr-ee-214376/update/versions/gitlab_18_changes/

Edited by Marius Bobin

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