Testing: Add Undo test for explicit persistence undo regression #15049
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Previously: #14955
This pull request seeks to add an end-to-end test to verify the expected behavior introduced in #14955. It was originally included with #14955, but due to general test instability in the Undo suite, it was reverted as blocked by #14915. #14915 has since been merged, so it should be safe and stable to introduce this test now.
Testing instructions:
Ensure end-to-end tests pass: