This patch migrates uses of getValueForSite to getValueArrayForSite.
Each hunk is self-contained, meaning that each one can be applied
independently of the others.
In the unit test, there are cases where the array length check is
performed a lot earlier than the array content check. For now, I'm
leaving the length checks where they are. I'll consider moving them
when I migrate uses of getNumValueDataForSite to getValueArrayForSite
in a follow-up patch.
9ad102f03b