[Xbox] DX fixes and improvements

[thexai]

Description

Backport of #19917

What is the effect on users?

Smooth playback of 4K HEVC 23.976/59.94 fps using DXVA2 hardware acceleration.

(for 4K capabilities is still needed merge #19659)

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed

[thexai]

@afedchin, remember review #19880. I'd like to merge these PR's to get functional Xbox nightlies (just like v19.2 would be). There are some Xbox users who have the ability to sideload and they will surely want to try these builds.

[Hitcher]

There are some Xbox users who have the ability to sideload and they will surely want to try these builds.

I have a Series X for testing purposes.