tests(helpers): separate customized asserts

[chronolaw]

Summary

KAG-5252

• move assertions to a separated lua module (only copy, no change)
• move lookup() to misc module

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]

[fffonion]

the naming of spec/details feels bit confusing. we might want to call something like spec/tools or spec/internal.
We also have spec/helpers that some of them also registers the custom assert functions. please consider consolidate them.
not blocker for this specific PR.

[chronolaw]

We will do it in the future, thanks. KAG-5330.

[kikito]

I agree that details is not a good name.

[chronolaw]

I will rename this directory after these PRs are merged.

[Tieske]

please validate that the documentation still renders properly when changing those helper files.

cd spec
ldoc .

should render the docs properly. Users access this through pongo docs.

[chronolaw]

please validate that the documentation still renders properly when changing those helper files.

cd spec
ldoc .

should render the docs properly. Users access this through pongo docs.

See comment #13630 (comment)

#13636

[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-13628-to-master-to-upstream upstream/master
cd .worktree/cherry-pick-13628-to-master-to-upstream
git checkout -b cherry-pick-13628-to-master-to-upstream
ancref=$(git merge-base b861d1fc030c43923151241d7e4f6710ab2a3a5a b558c17f6aace568554f4ca613affb2b4ac40cee)
git cherry-pick -x $ancref..b558c17f6aace568554f4ca613affb2b4ac40cee