[devtools] Disable shared process infobar

The developer guidance was never written and published
so we are delaying launching this feature in M124 and M125. It will
be reactivated in M126 or M127.

Bug: 335387800
Change-Id: If8fb523eb51d0092256cb23348f8e96b3efe5e01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5464200


Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1289313}