Finish the WASM test in scala-cli main repo

[Quafadas]

Version(s)
1.5.1

Describe the bug
This PR #3255 set out to add the ability to emit WASM from scala-cli. It omits (at this point)
https://github.com/Quafadas/scala-cli/blob/a26687a57d1e247ed5b89d82790aa377cd0f43c4/modules/integration/src/test/scala/scala/cli/integration/RunScalaJsTestDefinitions.scala#L327

in the test, actually running the emitted WASM. Instead, we assume it works transitively - it is tested here in the precursor PR to scala-js-cli.

https://github.com/VirtusLab/scala-js-cli/blob/ad320d48d18c4b3d586c26d907749c0c539f6be6/tests/test/src/org/scalajs/cli/tests/Tests.scala#L558

Running WASM requires node 22+ in GHA. As it's unclear (to me) what the implications of upgrading node in the scala-cli repo are, the PR is left "incomplete" by agreement. If node 22 was available, it should be the case, that copying and pasting the line linked above into scala-cli main would close the loop.

To Reproduce
Observe the TODO in the code.

Expected behaviour
scala-cli tests that the trivial WASM module it emits, runs as expected.

@Gedochao