Add rbc product config checks to run_integration_tests.sh

We already have a rbc product config ci postsubmit target,
but we want to add a small presubmit check as well.
run_integration_tests.sh is already run on presubmit, so
add it there.

Test: Presubmits
Change-Id: Id6fc282261507fb49a57b578ce2fdf20855dd6fd