Refactor unit tests to parameterize error scenarios in src/device-registry/bin/test/ut_index.js

As requested by @Baalmart, consider refactoring the unit tests to use parameterized error scenarios to reduce code duplication and enhance maintainability.

See the discussion at PR #3532: https://github.com/airqo-platform/AirQo-api/pull/3532 and the specific comment: https://github.com/airqo-platform/AirQo-api/pull/3532#discussion_r1779453497.