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Also changes regenerate_internal_cts_html to have slightly more debug
outputs and use `npm script` instead of `npm exec`.

Bug: None
Change-Id: Ifee95c5388cb562d3a5da4590ae3ef5402853f27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534730
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827243}