Perform Credential Check Changes

[cktricky]

The credential check ideally only occurs if you are actually doing something meaning, working with a module. So that's the first change - moving that logic into the if (args.module) section.

Secondly, we need to determine if the module being called is for AWS or for GCP and then perform the relevant credential check. This is because we have no reason to perform an AWS credential check if we're using a GCP module and vice versa.