Adding cleanup_build_name_worker to delete BuildNames older than 3 months

What does this MR do and why?

Adding cleanup_build_name_worker to delete BuildNames older than 3 months

This means users will not be able to search builds older than 3 months by name

Query for the select: https://console.postgres.ai/gitlab/gitlab-production-ci/sessions/38633/commands/118904

Query for the batch select/delete on BuildName:

https://console.postgres.ai/gitlab/gitlab-production-ci/sessions/38600/commands/118793

https://console.postgres.ai/gitlab/gitlab-production-ci/sessions/38633/commands/118912

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