RFE (e2e): allow registry override, and consistent labeling.

[timothysc]

Is this a FEATURE REQUEST?:
For air-gapped test runs it's a hard requirement to be able to pull the testing images from a private registry, and it's also a requirement to apply a unified label for cleaning.

What happened:
Currently, neither of these is supported in overrides to the e2e-test-framework

What you expected to happen:
Optional overrides with sane defaults.

/assign @timothysc
/cc @dims @kubernetes/sig-testing
/kind feature

[k8s-ci-robot]

@timothysc: There are no sig labels on this issue. Please add a sig label.

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The <group-suffix> in method 1 has to be replaced with one of these: bugs, feature-requests, pr-reviews, test-failures, proposals

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[PatrickLang]

does this overlap with #60848?

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[joshrosso]

ping @timothysc, wanted to verify this does overlap with #60848 ?

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

In response to this:

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