[Signin][Android] Update history sync educational promo button strings

Update the EducationalTipCardProvider to allow each card to set button
strings individually. The history sync card will have a different based
on the experiment param.

Bug: 409242912
Change-Id: I8708712a69c3062d86b37c52a20c2e90e1337b13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6458809
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Liza Bipin <mlbipin@google.com>
Reviewed-by: Xinyi Ji <xinyiji@chromium.org>
Reviewed-by: Menghan Yang <myuu@google.com>
Cr-Commit-Position: refs/heads/main@{#1448322}