Migrate remaining test images to DVC

[maxrjones]

Description of proposed changes

This PR migrates all remaining .PS files used for tests from Git to DVC. The tests workflow still fails due to some OS-specific failures, which can be investigated separately.

Part of #5724

Reminders

• Make sure that your code follows our style. Use the other functions/files as a basis.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Describe changes to function behavior and arguments in a comment below the function declaration.
• If adding new functionality, add a detailed description to the documentation and/or an example.

[PaulWessel]

Great!