[TabGroupIndicators] Account for StripLayoutGroupTitle when reorder tab

- Reorder StripView when tab drag is interacting with group title.
- Update drag threshold in #calculateTabGroupThreshold.
- adjust offset to account for group title.

demo: https://drive.google.com/file/d/1NffEemBZLtCz0WmqSpkn065OjRiP9uX_/view?usp=sharing

Bug: 327506847
Change-Id: I470e1d36a06e3cccb471004e3dd0d6e01b11ec92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5405135


Commit-Queue: Zhe Li <zheliooo@google.com>
Reviewed-by: Neil Coronado <nemco@google.com>
Cr-Commit-Position: refs/heads/main@{#1280459}