Cherrypicked b7f6b57e16 from stabilization branch because I knew it would have conflicts I needed to resolve.
See https://github.com/aws-lumberyard/o3de/pull/1462
This removes mostly benign (but noisy) messages about "Failed to find builder dependency".
ATOM-15136 Builder dependency errors reported in mainline
ATOM-15134 Replace GetPossibleDepenencyPaths Approach with Source Dependencies
SrgLayoutBuilder.cpp conflicted because it had been removed on development. The changes in this file are no longer relevant.
ShaderVariantAssetBuilder.cpp conflicted only because there were formatting changes inside the AddShaderAssetJobDependency() function.
Chris Santora
eda64b2d4c