[LEVEL CHANGE] Kubeflow Incubation to Graduation

# Project Moving Levels Checklist

This template outlines the administrative steps required when a project moves from one maturity level to another (e.g., Sandbox to Incubating, Incubating to Graduated).

- **Project Name:** Kubeflow
- **New Maturity Level:** Graduation
- **Project moving levels PR:** https://github.com/cncf/toc/pull/2237 https://github.com/cncf/toc/issues/1861

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## Administrative Checklist

- [x] TOC vote passed
- [x] Moving levels PR merged
- [x] Email Formation team to move the project's level in PCC.
- [x] Ensure the project is in Google Group mailing lists maintainers@cncf.io
- [x] Update the project's level and maintainer list in the aggregated [CNCF maintainer list](https://maintainers.cncf.io/). https://github.com/cncf/foundation/pull/1469
- [x] Move the project to its new level on the [CNCF Landscape](https://github.com/cncf/landscape/blob/master/landscape.yml). https://github.com/cncf/landscape/pull/4968
- [x] Move the project to the new level in [Clomonitor](https://github.com/cncf/clomonitor/blob/main/data/cncf.yaml) https://github.com/cncf/clomonitor/pull/1923
- [ ] Move the project to the new level in Devstats
- [x] Move artwork in [cncf/artwork](https://github.com/cncf/artwork) https://github.com/cncf/artwork/pull/674
- [x] Move project in maintainer spreadsheet
- [x] Sent email to CNCF PR team for marketing the change
- [x] Run CNCF Calendar update automation