[DirectX] Error when setting flags in the wrong version of Root Signature

[joaosaffran]

Root Descriptors and Static Sampler have flags that were introduced in version 1.1 and 1.2, currently, if the version doesn't support flags we just ignore them in RootSignatureMetadata.h when parsing. It would be better if we notice it and throw an error.

Originally requested here: #160210 (comment)