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Add apidiff check on PR presubmits
@joelanford @vincepri do you think this is better off added to verify.sh in the existing jobs, or added as a separate script + presubmit like in cluster-api?
If we do it separately we could make it optional to account for the occasional breaks. Maintainers can manually merge on breaks anyway, which probably makes more sense than Prow auto-merging api breaks, so I'm okay leaving it here. WDYT?
Also since the presubmits already set up the correct refs, I think this should "just work" in terms of checking the commits we care about for older releases and master too?