Pull kubeflow pipelines manifest from upstream using kpt

[Bobgy]

NOTE: the branch is based on #1241, so please merge it first.
To review this PR, please look at https://github.com/kubeflow/manifests/pull/1242/files/1c43da3eeeb2883e4072bd0681c73fc9aeca2e75..3fa9d2194ed715d2c9c53014207bf47622315ce6

Which issue is resolved by this Pull Request:
Resolves kubeflow/pipelines#3962

Description of your changes:
Pull kubeflow pipelines manifest from upstream using kpt

Checklist:

• Unit tests have been rebuilt:
  1. cd manifests/tests
  2. make generate-changed-only
  3. make test

[kubeflow-bot]

This change is 

[Bobgy]

/assign @jlewi

[rmgogogo]

a doc for the pull action?

[Bobgy]

just use it ./hack/pull_kfp_upstream.sh

Anything else we'd want to document?

[jlewi]

/hold
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jlewi

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[Bobgy]

Already merged in #1247.
/close
@rmgogogo Do you have further concerns? I can create a new PR with requested changes.

[k8s-ci-robot]

@Bobgy: Closed this PR.

In response to this:

Already merged in #1247.
/close
@rmgogogo Do you have further concerns? I can create a new PR with requested changes.

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