[PassGroup] Merge PSL and grouped matches save logic

Merge PSL matching logic with grouped matches to allow silently saving
the grouped match credentials. Both matches are considered weakly
affiliated matches now.


Tested on askubuntu.com/stackoverflow.com

Bug: 372635361
Change-Id: I442e0ec52497e8b701959de66c948cee900b6ea7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5938057
Reviewed-by: Viktor Semeniuk <vsemeniuk@google.com>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Din Nezametdinov <shaikhitdin@google.com>
Cr-Commit-Position: refs/heads/main@{#1372581}