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* [ATOM-15618] Shader Build Pipeline: Add UnitTest To Validate Shader Compiler Argument Processing Introduced With The New Supervariant System - Added new test suite in Gems/Atom/Asset/Shader/Code/Tests/SupervariantCmdArgumentTests.cpp - Refactored and improved the previously existing classes: GlobalBuildOptions, PreprocessorOptions and ShaderCompilerArguments to work well with the new ShaderSourceData::SupervariantInfo. - Moved command line argument processing function out of ShaderCompilerArguments and into its own utility namespace in Atom/RHI.Edit/Utils.h Signed-off-by: garrieta <garrieta@amazon.com>