Warn user when initializing a non-empty profile

[JonRoma]

Don't overwrite an already-existing profile in ~/.aws/credentials without securing user's approval to do so.

I can envision scenarios where the plugin can accidentally overwrite already-existing credentials, particularly when using the default credential.

I don't know what intelligence the plugin can exhibit – can it distinguish a valid credential from one that's expired, for example? It would in any event be desirable to prompt before rewriting the ~/.aws/credentials file and overwriting an existing credential.

[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 14 days.