Move digital-credentials transient user activation to wpt_internal
This CL moves digital-credentials transient user activation to
wpt_internal directory because transient user activation requirement
is not yet in digital credential spec.
BUG=None
Change-Id: I132412f0da5c4011be119dcd2d03675368f93f55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5675967
Reviewed-by: Nicolás Peña npm@chromium.org
Commit-Queue: Peter Kotwicz pkotwicz@chromium.org
Cr-Commit-Position: refs/heads/main@{#1322821}