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}

digital-credentials/identity-get.tentative.https.html

@@ -28,11 +28,6 @@
 
 // Requires browser to have mode where OS-presented digital-identity-prompt is
 // bypassed in favour of returning "fake_test_token" directly.
-promise_test(async t=>{
-  assert_false(navigator.userActivation.isActive);
-  let request = buildValidNavigatorIdentityRequest();
-  await promise_rejects_dom(t, "NetworkError", navigator.identity.get(request));
-}, "navigator.identity.get() fails if the page doesn't have user activation");
 
 promise_test(async t => {
   let request = buildValidNavigatorIdentityRequest();