Use OS provided temporary directory for tests #4361
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Currently
wasm-bindgen-test-runnerhas some logic in place to detect thetargetfolder generated by Cargo and places and hosts any generated files from there.This PR changes this to simply use the OS provided temporary directory through
tempfile, which was already in our dependency tree viarouille(viamultipart), to generate a uniquely temporary folder. This doesn't just remove the error-prone logic, but also allows us to confidently allow tests to run in parallel.