Revert "test: remove eslint comments"

This reverts commit 8d1f15bf
to preserve the original WPT code.

PR-URL: https://github.com/nodejs/node/pull/12743


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>