Enable KFP platform-agnostic-multi-user-k8s-native by default

[juliusvonkohout]

Validation Checklist

• I confirm that this is a Kubeflow-related issue.
• I am reporting this in the appropriate repository.
• I have followed the Kubeflow installation guidelines.
• The issue report is detailed and includes version numbers where applicable.
• I have considered adding my company to the adopters page to support Kubeflow and help the community, since I expect help from the community for my issue (see 1. and 2.).
• This issue pertains to Kubeflow development.
• I am available to work on this issue.
• You can join the CNCF Slack and access our meetings at the Kubeflow Community website. Our channel on the CNCF Slack is here #kubeflow-platform.

Version

master

Detailed Description

Enable

- ../applications/pipeline/upstream/env/cert-manager/platform-agnostic-multi-user-k8s-native # Pipeline Definitions

by default in https://github.com/kubeflow/manifests/blob/master/example/kustomization.yaml