feat(issue_links): Add ID field to IssueLink struct

aishahsofearequested to merge
gitlab-community/gitlab-org/api/client-go:issue-link-id into main

Add ID field to IssueLink struct to support GitLab 18.9+ API response.

The field is backward compatible and will be 0 for older GitLab versions.

This change is required for gitlab-org/terraform-provider-gitlab#6697 (closed)

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