This adds a daily scheduled CI pipeline that runs WPT tests against
the most recent epochs/daily every night. Results are uploaded to
wpt.fyi.
WPTs are run on all supported platforms, on both stable and canary.
These reports can be consumed by tools like `wptreport` or
https://wpt.fyi. The old style report could be removed in a future PR
when wpt.deno.land is updated.