Fix UX issues in URP Rendering Debugger

[arttu-peltonen]

Purpose of this PR

Fixes issues listed in https://fogbugz.unity3d.com/f/cases/1340619/

• Rewrite logic for URP debug widget conditional hiding.
• Hide Hue Tolerance & Saturation Tolerance fields for Default Luminance under Material Albedo validation.
• Change Map Size to percentage of screen instead of pixels.

NOTE: Setting wireframe color is not fixed - there is no API to set this in SRP right now. Scene View wireframe modes seem to use a special wireframe shader on most backends, with Vulkan being the only one to support colored wireframe at API level.

Conditional UI for albedo validation:

Map Size as percentage (default = 50%):

---

Testing status

Tested UI conditional behaves correctly both in Editor and Runtime. Map Size now respects viewport resolution as expected.

[TheoWong-pixel]

@oleks-k Might need to note in the docs later that Map size: is a percentage of the screen.
@arttu-peltonen I think we need to apply this change the HDRP mapsize implementations as well? unless that is already the case.

[arttu-peltonen]

@arttu-peltonen I think we need to apply this change the HDRP mapsize implementations as well? unless that is already the case.

On HDRP, there is already "Lighting > Debug Overlay Screen Ratio" which goes from 0 to 1 (essentially a percentage), and scales the shadow debug overlay accordingly.

[simon-engelbrecht-soerensen]

Looking good to me.

[Verasl]

LGTM

Would have liked the wireframe colour but this seems to be a Unity trunk change