This renames the existing v8_linux64_ubsan_rel_ng{triggered} into
v8_linux64_ubsan_vptr_rel_ng{triggered} and keeps using the
ubsan_vptr build and test config for it.

This adds build configs for the new builders:
v8_linux64_ubsan_rel_ng
V8 Clusterfuzz Linux64 UBSan - release builder

This also adds test configs for
v8_linux64_ubsan_rel_ng_triggered

NOTRY=true

Bug: chromium:853202
Change-Id: I0f9b4fba459a2c02a26e777f60773697e4d4d557
Reviewed-on: https://chromium-review.googlesource.com/c/1417456Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58915}