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This CL adds a new mb config that will be used by both the official and
try codesearch builders for lacros. It also updates the try builder console.

Bug: 1105242
Change-Id: I5e970b7213730c3bdf54ea786df252ed40200182
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311035
Commit-Queue: Erik Chen <erikchen@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790617}