🐛 [User] Fixed bugs on duplicate external SSO users creation and update #4188
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There were some problems when trying to create an already existing external user with the same externalUsername parameter: the back-end was allowing the operation. Other than that, It was not possible to update an external username, for example changing its e-mail, because the back-end was complaining about an already present user in the system.
I solved the issue changing the Userservice accordingly: other than fixing a method reference to findByExternalId that needed to be findByExternalUsername, I fixed the logic of searching duplicate users by externalIds and externalUsernames