[3.16] main/redis: disable flaky tests on ppc64le & s390x
I set !51203 (merged) to auto-merge but then build-3-16-ppc64le failed and I had already seen similar on ppc64le & s390x CI builders.
I set !51203 (merged) to auto-merge but then build-3-16-ppc64le failed and I had already seen similar on ppc64le & s390x CI builders.