Add Unique Instance ID to Seat Link Documentation

What does this MR do and why?

Resolves customers-gitlab-com#12908 (closed)

This change documents the new unique_instance_id field added to seat link records, which will be introduced in GitLab version 18.1.

This identifier helps uniquely identify a customer's Self-Managed GitLab instance. The update modifies documentation in two places: the licensing policy document now mentions this new field, and the subscription management documentation includes it in the list of data sent during the seat link sync.

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