e2e testing: load images into kind worker nodes in parallel

[vladikkuzn]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #9052

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vladikkuzn
Once this PR has been reviewed and has the lgtm label, please assign pbundyra for approval. For more information see the Code Review Process.

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• hack/testing/OWNERS

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[vladikkuzn]

/ok-to-test
/assign

[mimowo]

LGTM, thank you 👍 Leaving final tagging to @mbobrovskyi

/cherrypick release-0.16
/cherrypick release-0.15

[k8s-infra-cherrypick-robot]

@mimowo: once the present PR merges, I will cherry-pick it on top of release-0.15, release-0.16 in new PRs and assign them to you.

Details

In response to this:

LGTM, thank you 👍 Leaving final tagging to @mbobrovskyi

/cherrypick release-0.16
/cherrypick release-0.15

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