Remove gitlab_active_record vendor gem
What does this MR do and why?
This MR removes gitlab_active_record
vendor gem introduced in !108223 (merged).
We no longer need this as we are planning to leverage active-record-gitlab
instead in !111673 (merged).
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.