test: drop lodash dependency and use a local sortBy helper instead

[yoshinorin]

check list

• Add test cases for the changes.
• Passed the CI test.

Description

Removed lodash from devDependencies:

• lodash was only used for sortBy(data, '_id') in two test files (test/scripts/query.ts, test/scripts/model.ts) — pulling in the whole package just for a single-key sort is overkill.
• Added a small sortBy helper in test/helpers.ts and pointed both test files at it instead.

Additional information

see: You-Dont-Need-Lodash-Underscore

[SukkaW]

I am leaning toward having lodash.sortby as a devDeps.

It is not in deps, so it is never shipped to users. We only use it for testing. By sticking with lodash.sortby we can ensure there are no behavior changes.