[sheriff] blink: Mark more tests as long.

After crrev.com/c/3858507 some document-transition tests
started flakily fail with timeout. A couple of them was
fixed in crrev.com/c/3884945 by marking them as long.
Mark more timing out tests as long.

R=vmpstr@chromium.org, khushalsagar@chromium.org

Change-Id: I9218dda656965b85a9d2486d3dd70fa5b487a75b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3891051


Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Michael Ershov <miersh@google.com>
Owners-Override: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/main@{#1045779}