[test] Add more test suites for ubsan

NOTRY=true

Bug: v8:3770
Change-Id: Idae429b4f3c021a956b94b0ea4f3ff0570ec2ddf
Reviewed-on: https://chromium-review.googlesource.com/c/1406669Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58737}

infra/testing/builders.pyl

@@ -918,7 +918,10 @@
   },
   'V8 Linux64 UBSan': {
     'tests': [
+      {'name': 'mozilla'},
+      {'name': 'test262', 'shards': 2},
       {'name': 'v8testing'},
+      {'name': 'v8testing', 'variant': 'extra'},
     ],
   },
   'V8 Linux64 UBSanVptr': {