[test] Upgrade remaining testing on Linux to Bionic

Bug: chromium:1199430
Change-Id: I7bdbb6ecdf08e71b13825401ae0523a82386c48b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2851882
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Liviu Rau <liviurau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74204}