[CI] Fix link checker on fakenews.co (opensearch-project#6119) (opens…

…earch-project#6128)

* feat: add fakenews.co to allowlist



* feat: only exclude a known file



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(cherry picked from commit 2536ad1)

Signed-off-by: SuZhou-Joe <suzhou@amazon.com>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

.lycheeexclude

@@ -90,6 +90,7 @@ https://www.hostedgraphite.com/
 https://connectionurl.com
 http://169.254.169.254/latest/meta-data/
 http://company.net/*
+http://fakenews.co/opensearch-dashboards-test/v6.8.2.json
 
 # External urls
 https://www.zeek.org/