Update LFK references for p_ci_builds

What does this MR do and why?

It updates the loose foreign key definitions for p_ci_builds to match those of ci_builds. Extracted from !122919 (merged)

This also resolves this issue

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 #416455 (closed)