Display diffusion profile overrides in volume debug menu

[adrien-de-tocqueville]

Purpose of this PR

Added new debug widgets for the debug menu to show what diffusion profiles are currently in use by the volume system.

At the same time, i made a slight change to the volume debug table to improve readability, that you can see in the first screenshot below. I changed the column header name to be only the profile name, and added a row to link to the gameobjects contaning the profile. (that was an artist feedback from a long time ago)

This is how they show in the volume debug menu in the editor:

This is the same as above, but in play mode:

This is a test to show the look of the two new widgets, but outside of the volume debug menu table

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Testing status

See the screenshots
Tested in a standalone build

[github-actions]

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[alex-vazquez]

Really minor things, I think you should also have @arttu-peltonen and @JulienIgnace-Unity on the review.

[arttu-peltonen]

Looks great from my side. Only thing UI wise I noticed - the table view in the editor UI looks like it has darker font color now. Does this mean the UI is disabled, and you can't interact with it? It would be useful to be able to jump to the diffusion profile asset by clicking at it. If that's not easy to do, it's fine to leave as future improvement.

[adrien-de-tocqueville]

Indeed the font is darker because everything is disabled now it makes more sense (previously everything was disabled except the text fields). Though I reenabled the paramter column as this is not modifiable anyway, so it looks like that:

But the objectfields are clickable even if they are disabled !

[TomasKiniulis]

Did a quick check with multiple cameras, multiple volumes affecting only certain cameras and it looks good.

Ran into a couple of Rendering Debugger bugs, but none are PR related:
https://fogbugz.unity3d.com/f/cases/1379200/
https://fogbugz.unity3d.com/f/cases/1379202/