Add known issue for Fleet pending-upgrade during v1.5.x to v1.6.x upgrade#977

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yoursweetginger wants to merge 2 commits intoharvester:mainfrom

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Commits on Feb 17, 2026

Add troubleshooting steps for upgrade issues related to VLANs and Fleet chart
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Commits on Mar 11, 2026

Update docs/upgrade/v1-5-x-to-v1-6-x.md

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