Make the performance team the owners for PinnerService.java

In order to do this, updated the apct-tests/perftests/OWNERS file to
include the entire perf team and then added that to the
PinnerService.java definition.

Also removed srnvs@ since I am getting a "does not exist"
warning for that email.

Bug: 177918051
Test: Presubmit
Change-Id: I00f30f5131d38c4b073266e8c80d92d1ad734eb5