* refactor SSOSettings to use types
* test struct
* refactor SSOSettings struct to use types
* fix database tests
* fix populateSSOSettings() to accept an SSOSettings param
* fix all tests from the database layer
* handle errors for converting to/from SSOSettings
* add json tag on OAuthInfo fields
* use continue instead of if/else
* add the source field to SSOSettingsDTO conversion
* remove omitempty from json tags in OAuthInfo struct
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