Resolve "Create a new Gitlab issue when a new inconsistency is detected"

What does this MR do and why?

When a new schema inconsistency is detected for Gitlab.com, the system should create a new GitLab issue and add the proper labels.

To achieve this, we have introduced a new functionality to the schema_checker rake task. This new functionality will track new inconsistencies via the database and open a new issue for each new inconsistency.

We plan to run this rake task weekly only on Gitlab.com.

Screenshots or screen recordings

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #391876 (closed)