[WebAssembly] __USING_WASM_EXCEPTIONS__ -> __WASM_EXCEPTIONS__ (#92840)

We've decided to change `__USING_WASM_EXCEPTIONS__` preprocessor to
`__WASM_EXCEPTIONS__` given that it's more concise.

NOKEYCHECK=True
GitOrigin-RevId: 64f640680f7b1ddc8d2015eac75865f231166f8c
4 files changed