[clang] [WebAssembly] Disable running `wasm-opt` on components (PR #98373)

[Sam Clegg via cfe-commits]

sbc100 wrote:

I think the problem with creating a dummy shell script is that it would need to work on windows too.. I guess it would be better to have test that run on some platforms that no test at all.

In any case, I'm OK with having this land as-is for now, since this is feature that is already untested. 

https://github.com/llvm/llvm-project/pull/98373