Revert "Lacros: run skylab tests in fyi builder"

This reverts commit 3f8cb689aff27b7da8fb99c4702466f5b1427e0e.

Reason for revert: One builder couldn't run both gtest and skylab test.
It causes https://ci.chromium.org/p/chromium/builders/ci/lacros-amd64-generic-rel-fyi failure. I requested bots to create new builders for lacros to run skylab tests in Public.

Original change's description:
> Lacros: run skylab tests in fyi builder
>
> Test skylab in fyi builder first.
>
> Bug: 1375881
> Change-Id: I991b570de650fcaf5b40e9dc47e83b432f693bbf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4006917
> Commit-Queue: Jieting Yang <yjt@google.com>
> Reviewed-by: Sven Zheng <svenzheng@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1067789}

Bug: 1375881
Change-Id: Ie3211884865347d74e1cd384f2f07dbec82d4bdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4020770
Commit-Queue: Jieting Yang <yjt@google.com>
Reviewed-by: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1070009}