Remove vendor folder and copy knative/hack contents to hack/upstream folder

[upodroid]

Part of knative/infra#134

I have removed vendor folder and copied knative/hack in to hack/upstream.

Next steps:

• verify behaviour
• add a new action in knobots to sync knative/hack in to all repos
• I will make the changes in serving and eventing. Other WGs will sort out their own repos.

/cc @dprotaso @evankanderson @kvmware

[knative-prow]

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[upodroid]

This a bit more complex than I though.

• Need to upstream changes I made in hack/upstream around vendor/* folder.
• Do we need third-party/* folder?
• Fix lint errors in knative/hack schema folder.

[evankanderson]

This a bit more complex than I though.

• Need to upstream changes I made in hack/upstream around vendor/* folder.
• Do we need third-party/* folder?
• Fix lint errors in knative/hack schema folder.

Generally, vendor gets managed via go mod. We've been using third_party to track / keep items which can't be imported by go mod, but for which we're not the source of truth.

[knative-prow-robot]

@upodroid: PR needs rebase.

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[github-actions]

This Pull Request is stale because it has been open for 90 days with
no activity. It will automatically close after 30 more days of
inactivity. Reopen with /reopen. Mark as fresh by adding the
comment /remove-lifecycle stale.

[knative-prow]

@upodroid: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-knative-test-infra-prow-tests-image-build	d9e49be	link	true	/test pull-knative-test-infra-prow-tests-image-build

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[github-actions]

This Pull Request is stale because it has been open for 90 days with
no activity. It will automatically close after 30 more days of
inactivity. Reopen with /reopen. Mark as fresh by adding the
comment /remove-lifecycle stale.