GitLab

Reorganizes New Badge and IPH for Tab Groups into one study to match
the associated Finch study.

Additionally removes DesktopTabGroups since it is launched.

Bug: None
Change-Id: I09203587e18f82e3ddd51ebbe4a61c48d5ce4973
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459787Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815286}