Add Prefill Heavy E2E Test to Github Actions

[rlakhtakia]

What type of PR is this?
/kind feature
/area conformance-test

What this PR does / why we need it:
Add new github actions e2e test to validate and benchmark anything requiring the use of prefill heavy workloads.

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rlakhtakia
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[k8s-ci-robot]

Hi @rlakhtakia. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[liu-cong]

/ok-to-test

[shmuelk]

@rlakhtakia How is this workflow launched? I hope it isn't launched on every PR, I saw a timeout of 7200 (seconds I assume).