Parcel 2: multiple targets with the same environment are not output

[devongovett]

If target descriptors like the following are provided to the Parcel API or in package.json, only one of them will be output. This is because the environments are the same between them so assets are only compiled once. This is correct, but we should still write the output bundles to all targets.

  targets: {
    client: {
      distDir: "dist/client"
    },
    clientModern: {
      distDir: "dist/clientModern",
    },
    server: {
      distDir: "dist/server"
    }
  }