Working with 'Available Motion Sets UI' in the Animation Editor doesn't work right

[pwalterscarb]

Working with 'Available Motion Sets UI' doesn't work right, it's very frustrating to work with and try to edit various motions within the sets.

• I can't shift the height of the border between 'Available Motion Sets UI' and 'Motions', it seems locked. And so I can't make the size of the 'Available Motion Sets UI' any larger, it's stuck to being small.
• When I scroll down and select a motion set, the view kicks it back up to the top, the view doesn't stay on the set that I have selected. If I go away and come back, there's no way of knowing what I selected.
• Using the arrow keys to scroll through the 'Available Motion Sets UI' doesn't work, it only goes down one and then goes back to the top even though I'm hitting the down arrow.

Video of working with the UI.
https://github.com/o3de/o3de/assets/50999342/b8bad40e-defe-4503-bf19-10373ff5e8c1

Found in Branch
https://github.com/carbonated-dev/o3de
Commit ID from o3de/o3de Repository
custom engine version 2310.2

Desktop/Device:
Device: [PC]
OS: [Windows]
Version [10]
CPU [Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz, 3501 Mhz, 6 Core(s), 12 Logical Processor(s)]
GPU [NVIDIA GeForce RTX 3090]
Memory [32GB]