[Hdrp][Compositor] Fix flickering with camera stacking #1485
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Purpose of this PR
https://fogbugz.unity3d.com/f/cases/1264552/
https://fogbugz.unity3d.com/f/cases/1266223/
Camera stacking was broken in the graphics compositor (we were getting flickering) because the draw-order of the layer cameras was overwritten when updating other runtime properties.
This PR also fixes some errors that we were getting because the internal layer cameras, which are created as clones of the user cameras, were also cloning children and other components.
Testing status