Workaround: Click away from the Project Validation window so it is not visible

Steps to reproduce:

1. Create a 3D URP Project
2. Install the OpenXR Plugin Package
3. Import the three associated Samples
4. When prompted to change APIs accept, decline the restart
5. Wait for compilation to finish and open the Project Validation panel under the XR Plug-in Management's Project Settings
6. Do anything in the Editor, like scrolling Package Manager's Unity Registry List and observe performance

Actual results: All Editor actions are delayed when the Project Validation panel is open in an empty Project, if the Project is large in size, the Editor becomes unusable while the Window is open, constant repainting occurs. The Project Validation Window is automatically opened once the Packages are installed, so this affects the majority of users

Expected results: No constant performance issues when the Project Validation panel is open

Reproducible with versions: 4.4.0, 4.5.4, 4.6.0 (2023.2.20f1 - 6000.6.0a5)

Not reproducible with versions: 4.3.3

Tested on (OS): Windows 11