🌱 Add Harbor to ADOPTERS.md

[clubanderson]

Re-opened from #3991 (merged in error and reverted in #4034). Awaiting approval from external project contributor before merging.

[kubestellar-prow]

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Pull request overview

Adds Harbor to the repository’s adopters list (ADOPTERS.MD), expanding the documented set of organizations/projects benefiting from KubeStellar Console and linking to the relevant install mission and upstream reference.

Changes:

• Add a new adopter table row for Harbor.
• Include links to Harbor’s website, the Harbor install mission, and the referenced upstream GitHub issue.

[kubestellar-prow]

PR needs rebase.

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