feat: US152718 - Cleanup userOwnedByMultipleSourceSystems usage

[zwilson2]

US152718: Course Merge - UI - Allow users from multiple SIS to merge

[github-actions[bot]]

PR Checklist:

Did you use a semver keyword in a commit message?

• [x] Yes I used one in at least one of my commits
• [ ] No but I will use a semver keyword in the commit message when I merge and squash

Did you paste the Rally US URL in the description?

• [x] Yes
• [ ] No as there's no corresponding Rally US

[ghost]

:tada: This PR is included in version 2.108.0 :tada:

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot :package::rocket: