Make github actions run webassembly tests

[LLFourn]

Many of the tests are dual declared as wasm tests as well with:

https://github.com/LLFourn/secp256kfun/blob/6dd73322af7c57f98b3217342b6dfdfa004e77a3/secp256kfun/src/macros.rs#L216-L226

But the tests don't run on github actions.