Use singular OWNERS file.

Rather than every project having an OWNERS with explicit people, just
use one centralized OWNERS file and have every other OWNERS reference
that. This way when the team changes there's only one place that needs
to be updated.

Bug: 346876927
Test: N/A
Flag: EXEMPT OWNERS change
Change-Id: Ia51b1745f14bda22629e05cd33f6c807cf6f6565
1 file changed