Remove project.owner from container expiry worker

What does this MR do and why?

Remove an instance of project.owner call from a service called by a cron process with nil.

We're moving towards Owner role being possible in Projects. Because multiple owners will be possible soon, we are phasing out owner.

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

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 #350603 (closed)