[202x] Remove HLSL Effects Syntax Support

[llvm-beanz]

Is your feature request related to a problem? Please describe.
DXC has never supported the "effects" runtime features, and issues warnings noting that any effects annotations are ignored. For HLSL 202x we should convert those warnings to errors and not support them in HLSL 202x.

Describe the solution you'd like
Report errors for unsupported effects syntax when used in DXC.

[llvm-beanz]

Notes from design meeting:

• In DXC we should make all effects syntax parsing hard errors in HLSL 202x mode
• In Clang we should make effects-like syntax that is valid C++ 11, warn that it is a 202y extension (see: C++-style initialization of vectors (int2 x{0,1}) does not work, but compiles. DirectXShaderCompiler#7111 for an example).