[Deduplication] Added support for websites when parsing dedup protos

Bug: b/282876219
Change-Id: If124ca016d061adf22c1b15a0fda35affe20cee1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4542006


Reviewed-by: Melissa Zhang <melzhang@chromium.org>
Commit-Queue: Sharmin Zaman <sharminzaman@google.com>
Cr-Commit-Position: refs/heads/main@{#1147613}