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This CL adds an optional linux-lacros-rel try builder, and it will
replace linux-lacros-compile-rel in the future.

Bug: 1116180
Change-Id: I46f3827848ff64ade1773d18d146a888312b4bd1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354723Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798204}