[VFX] Fix new SG integration & Sample Texture/Buffer (to 21.2) (#5605)

* [VFX] Fix new SG integration & Sample Texture/Buffer (#5416)

* Fix missing texture & buffer declaration

While using new SG integration, the required textures weren't declared.
TODO : Fix 35_ShaderGeneration, we are facing multiple definition
WIP : I'm not sure about the side effect of this change & we need to register a fogbugz

* *No change : add note

* Fix initial solution from d0246e1

If a input is declared in SG, we have to skip it here.

* Add graphicTest coverage (TODO : Update image references)

* Update reference image for D3D

TODO : Update OSX Image reference

* Equivalent integration but move the responsability of filtering to subtarget

* *Missing image reference update from D3D12

* Revert note in VFXShaderGraphParticleOutput.cs

* Update changelog & Missing image reference

* Missing WriteBuffer to support mesh sampling

* Minor : Update Comment

* Fix missing graphicsBuffer declaration

Resolve issue #5416 (review)
# Conflicts:
#	com.unity.visualeffectgraph/CHANGELOG.md

* Move changelog entry from added to fixed

Author: PaulDemeulenaere

TestProjects/VisualEffectGraph_HDRP/Assets/AllTests/VFXTests/GraphicsTests/35_ShaderGraphGenerationFTP.unity

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