optasm way isn't tested in wasm32 CI jobs

The wasm32 target does have a native codegen, and wasm32-wasi-ghc --info shows:

 ,("Have native code generator","YES")
 ,("Target default backend","native code generator")

So naturally the optasm way should be tested. However, I just checked the CI job log from a recent master validate pipeline (https://gitlab.haskell.org/ghc/ghc/-/jobs/1702594/raw), and optasm way is not compiled/run by the test suite. The culprit seems to be hadrian which passes -e ghc_with_native_codegen=False to the driver.

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