libyang: upgrade to v3 step 6 -- cleanup libyang1 references#21790

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bradh352 wants to merge 7 commits intosonic-net:masterfrom bradh352:bradh352/libyang3-pr6

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Commits on Feb 19, 2025

IGNORE THIS COMMIT: swss-common use libyang3 (PR sonic-net#21752 )
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IGNORE THIS COMMIT: sonic-mgmt-common use libyang3 (PR sonic-net#21789 )
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Commits on Feb 20, 2025

libyang3: cleanup any references to libyang1
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