* [WIP]: Force lowercase login/email for user CRUD
* warn and remove use of userCaseInsensitiveLogin check
* remove log warning
* reimplementation of the caseinsensitive
* need to decide if we want the conflict check or not
* remvoved the tests for conflict user by getEmail, getLogin
* added tests for user lowercase migration
* wip: emails next
* tests for email lowercasing
* review comments
* optimized login and email lookup before migrating
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