chore: generate mfa secret in backend (#2930) [skip e2e]

* chore: get mfa secret from backend

* chore: remove unused code

packages/services/src/Domain/Mfa/MfaServiceInterface.ts

@@ -1,7 +1,6 @@
 export interface MfaServiceInterface {
   isMfaActivated(): Promise<boolean>
   generateMfaSecret(): Promise<string>
-  getOtpToken(secret: string): Promise<string>
   enableMfa(secret: string, otpToken: string): Promise<void>
   disableMfa(): Promise<void>
 }