backport tests: test mitigation for the segfault of if-match 412

[chobits]

You don't need to merge this pr, because the original segfault fix(removing 412 from template) has been verified mannually (see KAG-2394).

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

Fix #[issue number]