Iam 734 fix

[nsklikas]

• fix rate limiting logic
• Do no validate the request when issuing the response.This caused issues with the introduction of rate-limiting. For this reason I broke up code validation into 2 functions: ValidateCode and ValidateCodeSession. The first needs to implement fast checks that can be performed before we fetch the code session from the database and the second implements the existing ValidateCode logic, that validates the code session data (e.g. if the code has expired).

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