cleanup(vpa): remove go vendoring for e2e

[davidspek]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR removes the e2e/vendor directory for the VPA. Vendoring the dependencies into the repo not only increases the size, but also makes reviewing PRs that include dependency changes more difficult. Sometimes to the point of breaking the GitHub UI like in #7551 and likely this PR.

Which issue(s) this PR fixes:

Fixes #7570

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @davidspek. Thanks for your PR.

I'm waiting for a kubernetes 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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[adrianmoisey]

/ok-to-test

[davidspek]

/test pull-kubernetes-e2e-autoscaling-vpa-full

[adrianmoisey]

/lgtm

[davidspek]

/assign kgolab

[davidspek]

/assign gjtempleton

since this changes a file in the hack/ directory and you recently approved a PR with a similar change.

[davidspek]

/assign raywainman

For the VPA part of the changes

[raywainman]

Thanks so much for the cleanup.

/lgtm

/approve

[gjtempleton]

Thanks for this!
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidspek, gjtempleton, raywainman

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Needs approval from an approver in each of these files:

• hack/OWNERS [gjtempleton]
• vertical-pod-autoscaler/OWNERS [gjtempleton,raywainman]

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