Update Hyku Test Plan with Pals Features/Contributions

[ShanaLMoore]

Reference PR: samvera/hyku#2138

Update Hyku Test Plan to reflect the features Pals contributed back to Hyku.

HYKU TEST PLAN: https://docs.google.com/document/d/1jk29qG4eE69tPbGA9hg5hOCmNRZ77KFN6dTjVV2358g/edit#heading=h.rifwygk2508n

[ShanaLMoore]

Closing, instead of treating this as a separate task we will update the plan along the way by comparing the diffs of the original test plan vs what we now see, and updating the test plan.

ref convo