[TabGroupReorder] Foreground the reordering tabs

Foreground the reordering tabs.
-The group indicator is not yet foregrounded. This will be done in a
 followup where we'll also add the bg shape.

Bug: 376068489
Change-Id: I49b933d3559e2c3154f1d6a79f949100bffc1e22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6092911
Reviewed-by: Zhe Li <zheliooo@google.com>
Commit-Queue: Neil Coronado <nemco@google.com>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Sirisha Kavuluru <skavuluru@google.com>
Cr-Commit-Position: refs/heads/main@{#1397574}