[HLSL] Remove HLSLResource

[bogner]

Once the HLSLResource attribute has been split up (See #98193, #102392, llvm/wg-hlsl#39, #104855), we no longer need the big HLSLResource attribute. We can simply remove the attribute.

Depends on #114126

[bob80905]

Blocked on the design and implementation of the replacement attributes, which Justin is defining in a spec.

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Justin Bogner (bogner)

Once the HLSLResource attribute has been split up (See https://github.com//issues/98193, https://github.com//issues/102392, https://github.com/llvm/wg-hlsl/issues/39, https://github.com//issues/104855), we no longer need the big HLSLResource attribute. We can simply remove the attribute.