VPA: Remove the vendor dir

[ialidzhikov]

Which component are you using?:
/area vertical-pod-autoscaler

Is your feature request designed to solve a problem? If so describe the problem this feature should solve.:
Remove the vendor dir for dev-productivity purposes. Right now, on updating dependencies the GitHub web app crashes. The vendor dir also causes delays while cloning the rep and while resolving conflicts (you get unnecessary conflicts under the vendor dir).

Describe the solution you'd like.:

Remove the vendor dir for the VPA. The cluster-autoscaler no longer has a vendor dir. It seems to be removed with #6973.

Describe any alternative solutions you've considered.:
N/A

Additional context.:

See #7551 (comment)

[adrianmoisey]

/remove-kind feature
/kind cleanup

[adrianmoisey]

/assign davidspek

[k8s-ci-robot]

@adrianmoisey: GitHub didn't allow me to assign the following users: davidspek.

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In response to this:

/assign davidspek

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[adrianmoisey]

/open

Still waiting on #7572

[adrianmoisey]

/reopen

[k8s-ci-robot]

@adrianmoisey: Reopened this issue.

In response to this:

/reopen

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.