Make contrib.buildinfo use compileModuleDeps rather than moduleDeps

[lihaoyi]

Follow up from #2562, to avoid potentially having duplicate Mill classfiles on the classpath

[lolgab]

If we want to avoid the dependency to scalajslib and scalanativelib we can maybe use reflection or structural types to check if the module is a ScalaJSModule, for example by checking if the module has scalaJSVersion: Target[String] available or scalaNativeVersion: Target[String].

PR implementing the approach here: #2569