Previously only changes authored by Googlers would be tested, leaving
external contributions untested until the next 'daily' run.

This change enables testing of external contributions when a Googler
added a Code-Review+1, Code-Review+2, or Presubmit-Ready+1 vote.

Change-Id: I2f5c327848ad507d75967c9fd7f16085d0729a1a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/45508Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>