Small cleanups to process_success_login

[bdraco]

Proposed change

• add typing
• avoid ip_address conversion when not enabled
• convert to callback function since nothing is being awaited
• adds some missing test coverage

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• Breaking change (fix/feature causing existing functionality to break)
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• This PR fixes or closes issue: fixes #
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[bdraco]

It looks like we have no coverage for the bottom part of this function.

Now would be a good time to add it

[janiversen]

LGTM. Thanks.

[bdraco]

Thanks