[CodeHealth] Batch omaha tests

Bug: 1474102
Change-Id: I334e9288ef9a66257533d8c7c524110b62736af2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4799936


Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Zhiyuan Cai <zhiyuancai@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1187932}