Combined MFA should throw DuplicatedMechanismException

[rodrigoareis]

JIRA Ticket

SDKS-2627 Combined MFA should throw DuplicatedMechanismException for existing accounts

Description

While registering a Combined MFA account, the SDK should throw a Duplicated mechanism error if any of the included mechanisms is already registered on the app.

Definition of Done Checklist:

• Acceptance criteria is met.
• All tasks listed in the user story have been completed.
• Coded to standards.
• Ensure backward compatibility.
• API reference docs is updated.
• Unit tests are written.
• Integration tests are written.
• e2e tests are written.
• Functional spec is written/updated.
• Example code snippets have been added.
• Change log updated.
• Documentation story is created and tracked.
• Tech debts and remaining tasks are tracked in separated ticket(s).

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