Add to testing/trigger_scripts OWNERS

Adds bsheedy@ and ynovikov@ as owners of //testing/trigger_scripts.

Change-Id: I277c8fa0c9be888d56330763f36adefc61aa2153
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628493
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843342}

testing/trigger_scripts/OWNERS

+bsheedy@chromium.org
 eyaich@chromium.org
 kbr@chromium.org
 wenbinzhang@google.com
+ynovikov@chromium.org