Use partitioned table for CommitStatus

What does this MR do and why?

changes the table names for CommitStatus to use the routing table for ci_builds. This change was enabled in production via gitlab-com/gl-infra/production#16387 (closed)

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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

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Related to #416455 (closed)