Fixes#1270
After 5 consecutive failed logins from the same user, we now prevent the
user from logging in even with the correct password until they reset it
via their email, or wait an hour.
- After failure threshold is reached, all further login attempts are rejected
- Attempts for invalid email addresses are also tracked
- On 6th try, a reset password email is automatically sent, only once
- Failed login counter resets after an hour of no further logins after last attempted login.
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Co-authored-by: Ilya Kreymer <ikreymer@gmail.com>
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