Replace owner check with team owner method check

What does this MR do and why?

Replace a check for project.owner with a method check.

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

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

Related to #350603 (closed)