* feat(API): permissive email check in reset & verification
In order to not force users to be case sensitive when asking for
password reset or resend email verification. When there's multiple
emails where the only difference in the local is the capitalized
letters, in those cases the users has to be case sensitive.
closes#6570
* feat(API/login): permissive email handling
Allow case insensitive email when there's no other candidate.
closes#6570
* code review changes
* Fix tests
* Add more duplicate email checks
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Co-authored-by: Chocobozzz <me@florianbigard.com>
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