[Tab Group Sync] Delete tab groups if entirely removed by quick delete

When closing all tabs in a tab group via QD or CBD remove the synced tab
group as well.

The decision here has changed so updating to reflect new requirements.

Fixed: 345548182
Change-Id: I4b93e337085d945c0592116649b1c1afe87506b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5605768
Auto-Submit: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Zaina Al-Mashni <zalmashni@google.com>
Reviewed-by: Zaina Al-Mashni <zalmashni@google.com>
Cr-Commit-Position: refs/heads/main@{#1312145}