🌱 Add Kubean to ADOPTERS.md

[clubanderson]

Re-opened from #3992 (merged in error and reverted in #4034). Awaiting approval from external project contributor before merging.

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Pull request overview

Adds Kubean as an adopter in the repository’s root adopters list, extending the documentation of projects using or benefiting from KubeStellar Console.

Changes:

• Add a new adopter table row for Kubean, including project link and install mission link.
• Reference the Kubean maintainer using a profile link (not an @ mention) and include the supporting upstream issue link.

[kubestellar-prow]

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