chore(tests): add http2 smoke test

[windmgc]

Summary

This PR adds a simple smoke test to check if the HTTP/2 listening port can respond with valid response data.

Checklist

• The Pull Request has tests
• There's an entry in the CHANGELOG
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Full changelog

• [Implement ...]

Issue reference

KAG-854

[fffonion]

let's verify this once by copy pasting the alpine piece from matrix-full.yml to matrix-commitly.yml, and then revert back before merge. so we don't need to wait for another day to test it, or by manually click the button to release.

[windmgc]

Superseded by #10454 as smoke test cannot be triggered from personal fork due to lack of credentials so we cannot test in this PR. cc @fffonion