WIP: add auditor e2e test for promoting an image to a subproject prefix

[listx]

/hold

With #200 passing e2e tests, I am pushing this one up (without the fixes, but with the new e2e test) to see if I can reproduce what I've been seeing in production. Because why not?

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[listx]

/unassign @tpepper @bartsmykla

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/uncc @tpepper @bartsmykla

[k8s-ci-robot]

@listx: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-cip-auditor-e2e	1f18282	link	/test pull-cip-auditor-e2e

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[listx]

Cool, I can see

(db4a9afe-cc8c-453a-8f99-0b8c0f0ec42c) TRANSACTION REJECTED: could not determine source registry: &{INSERT us.gcr.io/k8s-gcr-audit-test-prod/subproject-foo/foo@sha256:2af5205553239e0eb17c544bc1e90c2d6173012a191f0a44131aa2f9c44bb511 }

in the logs for this invocation, so indeed I can reproduce the error described in #191 with this test case. I think this pretty much nails it --- #199 and #200 are ready for merging...! @justinsb @bartsmykla

[listx]

Closing this PR as the bug reproduction has been demonstrated.
/close

[k8s-ci-robot]

@listx: Closed this PR.

In response to this:

Closing this PR as the bug reproduction has been demonstrated.
/close

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