chore(llm): remove llm model schema auth required

[oowl]

Summary

Checklist

• The Pull Request has tests
• A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Issue reference

AG-90

[team-gateway-bot]

Cherry-pick failed for master, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally.

git remote add upstream https://github.com/kong/kong-ee
git fetch upstream master
git worktree add -d .worktree/cherry-pick-13469-to-master-to-upstream upstream/master
cd .worktree/cherry-pick-13469-to-master-to-upstream
git checkout -b cherry-pick-13469-to-master-to-upstream
ancref=$(git merge-base 8ae3dd5726eb86a0360fd115b96b059b056544eb 70db77785939e84bba53507d081304cd5d637b71)
git cherry-pick -x $ancref..70db77785939e84bba53507d081304cd5d637b71