[lensoverlay] Add param to disable CSB zero suggest

This adds two params. One to disable the suggest requests from being sent, and another to disable the ghost loader. Without the new param to disable the ghost loader, the ghost loader and hint text can still show up even if no suggest requests are being sent.

Fixed: 405254580
Change-Id: Id6d9766b1908f9e24e09571d508bd2e99e047fdc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6394335
Reviewed-by: Ali Stanfield <stanfield@google.com>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Nihar Majmudar <niharm@google.com>
Commit-Queue: Duncan Mercer <mercerd@google.com>
Cr-Commit-Position: refs/heads/main@{#1438209}