oak-segment-remote and oak-segment-aws Redis tests fail with ARM processor (Apple M1)

I'm can't build oak-segment-remote with my new laptop (Apple M1 chip) due to https://github.com/kstyrc/embedded-redis/issues/51 - looks like https://github.com/kstyrc/embedded-redis is used, which uses an ancient version of Redis.

There is a fork of https://github.com/kstyrc/embedded-redis that seems more up-to-date: https://github.com/ozimov/embedded-redis. The last commit there was in 2020. The issue https://github.com/kstyrc/embedded-redis/issues/51 was fixed a bit later. So switching to that embedded Redis version doesn't resolve the issue either.

If Redis isn't available, then the test shouldn't fail... instead, the test should be skipped. this is what we do for mongodb: if it isn't available, then those tests are not run.