🌱 Add Longhorn to ADOPTERS.md

[clubanderson]

Re-opened from #3999 (merged in error and reverted in #4034). Awaiting approval from external project contributor before merging.

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Pull request overview

Adds Longhorn to the project’s adopters list to reflect Longhorn’s use/engagement with KubeStellar Console and to provide a reference link to the related install mission.

Changes:

• Adds a new ADOPTERS.MD table entry for Longhorn.
• Includes links to relevant Longhorn maintainer profiles, the referenced Longhorn issue, and the Longhorn install mission.