[LEVEL CHANGE] k8gb moving from Sandbox to Incubation

# 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:** K8sgb
- **New Maturity Level:** Incubation
- **Project moving levels PR:** https://github.com/cncf/toc/pull/2210

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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/1464
- [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/4945
- [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/1922
- [ ] 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/673
- [x] Move project in maintainer spreadsheet
- [x] Sent email to CNCF PR team for marketing the change
- [ ] Run CNCF Calendar update automation