4K Resolution and High DPI Scaling in Linux aren't completely affected by System Display Scaling

Unreal doesn't change appearance when changing system configuration display scaling options. Editor Texts are still quite small and don't change based on the Display Scaling %. This bug also causes the Context Menu to appear offscreen.

This was reported and tested in 4.22.3 (CL-7053642). This was reproduced in 4.23 (CL-8115738) and Main 4.24 (CL-8292946)

Need a Linux machine with a 4K monitor and High DPI

1. Open the UE4 Editor and create a Blank project
2. Observe scaling and text rendering
3. Close the Editor and change the System Display Scaling to 200%
4. Reopen the Editor and make sure "Enable High DPI Support" is checked.
5. Right-click in the Content Browser or open up Editor Preferences

Results: Only certain menus have been scaled

Expected: Editor Text is readable and scaled up.