test(ai-proxy): fix red test due to other feature break http protocol behavior

[oowl]

Summary

In 7d71b6b, we introduce disable http2 alpn in ai-proxy plugin, now all http2 force protocol test will failed, so do not need http2 test in ai-proxy anymore, because we have been disabled http2.

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

Fix AG-119

[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-13848-to-master-to-upstream upstream/master
cd .worktree/cherry-pick-13848-to-master-to-upstream
git checkout -b cherry-pick-13848-to-master-to-upstream
ancref=$(git merge-base 713908f565f80ad83a57ac304114252d7e05c3d6 d0d5d6b73a2c53dbde1c59c590c10e6122c31c33)
git cherry-pick -x $ancref..d0d5d6b73a2c53dbde1c59c590c10e6122c31c33