Force conformance tests to fail properly

[sjberman]

Problem: If the conformance test Pod runner failed, the make process would still pass. This is because the failure code would not propagate to outside of the Pod.

Solution: After the Pod runs, check the exit code and fail it it's non-zero. Used a bash script for this because running the kubectl get pod command in the Makefile would not return an Errored Pod for some reason. Only worked in bash.

Closes #1784

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