Jira twin of: [https://fogbugz.unity3d.com/f/cases/1355226/]

*Steps to reproduce:*
# Download and open the attached project (OptixMacOSUIBug.zip)
# Open SampleScene
# Open Lighting window (Window > Rendering > Lighting)
# Notice that Optix denoiser is selected despite not being supported on the platform

{*}Notes{*}:
* An info message is shown prompting users to switch to another denoiser
* Initiating a bake does not select a correct denoiser (which is OIDN in this case)
* Affects Optix and Radeon Pro denoisers on macOS

*Suggestions:*
* Move info box to the top of the Filtering field
* Do not duplicate info box
* Change info box text to "The current hardware or system configuration does not support the selected denoiser. Will use Open Image Denoiser instead."