Improve batched background migration checker warning message

Context:

This is the current warning message:

 @project_278964_bot2 · 15 hours ago
Maintainer

Please finalize the {"migration_job_name"=>"BackfillFindingIdInVulnerabilities", "description"=>"Backfills finding_id column on vulnerabilities table for a proper 1:1 relation", "feature_category"=>"vulnerability_management", "introduced_by_url"=>"!130058 (merged)", "queued_migration_version"=>20231116105945, "milestone"=>"16.4", "finalize_after"=>"2023-12-15", "merge_request_id"=>"130058"} batched background migration!More info: https://docs.gitlab.com/ee/development/database/batched_background_migrations.htmlNote: If the batched background migration is already finalized please update the dictionary.Alternately if the migration is not ready to be finalized, please update the date in the dictionary.cc @dfrazao-gitlab @gitlab-org/database-team/triage

link: gitlab-org/gitlab!130058 (comment 1697645407)

We should beautify this message.