Site Data Improvements: Update strings in clear dialogs

Updated to match the mocks:
https://docs.google.com/presentation/d/1ZROi0FQK4VtfeCvNfOU1xSDJ14eCs6NCDUsI0ZmV7jQ/edit#slide=id.g137b95bdda3_1_21

Screenshots: https://screenshot.googleplex.com/4kivggocDKWybdR.png
and https://screenshot.googleplex.com/9Mi69avYRDqkBUn.png

Bug: 1342991
Change-Id: I2bc66e79dcbe84edb1c5afca96a854364f022d24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4545218


Reviewed-by: Ehimare Okoyomon <eokoyomon@chromium.org>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: Ehimare Okoyomon <eokoyomon@chromium.org>
Auto-Submit: Andrey Zaytsev <andzaytsev@google.com>
Cr-Commit-Position: refs/heads/main@{#1147538}