[HLSL] Remove old resource annotations

[hekota]

Once we move UAV, SRV and constant buffers to the LLVM target types we can remove the metadata resource annotations since they are no longer needed.

That means removing all of the code that generates the !hlsl.uavs, !hlsl.srvs and hlsl.cbufs metadata from CGHLSLRuntime.

Related task: #104862