switch trusty -> xenial for linux tsan CQ/CI builder

This is step 2 written in
https://chrome-internal-review.googlesource.com/c/infradata/config/+/1324360

I updated suppression list for data race happened in libgobject.so.
e.g.
https://ci.chromium.org/p/chromium/builders/try/linux_chromium_tsan_rel_ng/282235

Bug: 954450
Change-Id: I08c167b1b4f9077c1f74985b13e89c46f6ca203d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621768
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662056}
4 files changed