This works around an apparent k8s bug where startupProbe does not
respect periodSeconds.
Instead, use a readinessProbe.
Change-Id: I43251284db336ea5ade5b1735a867cf294a7b1c4
We no longer need to carry a patch and build Solana, and can use
solana-test-validator (with sleepy PoH!) instead. This significantly reduces
build times and will make downstream testing much easier.
Also remove the remnants of do.sh and the old BPF toolchain.
Test Plan: Ran E2E tests.