Fix sso login

[michaeljguarino]

The login method validation technically fails for SSO (which means us lol). We can trust that login source better than other 3p auth providers so don't validate login method there.

Test Plan

unit test

Checklist

• If required, I have updated the Plural documentation accordingly.
• I have added tests to cover my changes.
• I have added a meaningful title and summary to convey the impact of this PR to a user.
• I have added relevant labels to this PR to help with categorization for release notes.

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