fix: unable to use keyword args when including the Labels extension

[ElMassimo]

Description 📖

This pull request fixes a bug which is described in:

• Unable to use labels with kwargs in job initializer  #1350

Background 📜

For backwards compatibility, activejob uses ruby2_keywords to capture arguments that are passed to perform_now and perform_later.

That ensures that it can serialize and deserialize keyword arguments differently.

GoodJob::ActiveJobExtensions::Labels overrides the initialize method, but it does not use ruby2_keywords, so by the time activejob receives the arguments, keyword arguments have become a plain Hash.

The Fix 🔨

Passing all arguments as-is, by using ... instead of *arguments, since the module doesn't need to use the parameters.

Notes ✏️

Using ruby2_keywords(:initialize) would also work, but since this library no longer supports CRuby 2.6 and 2.7, ... is the way to go.

[bensheldon]

Thanks @ElMassimo. That makes sense about ruby2_keywords being the piece that allows the initialize(*arguments) method signature to handle kwargs.

I'm happy with this change. You're right that we do finally have ... support 👍🏻