[Key Connector] QA fixes for CLI and Desktop (#544)

* Make UserVerificationService compatible with CLI

* Refactor error handling

* Fix i18n key name

* Add apiUseKeyConnector flag to TokenResponse

* Always require keyConnectorUrl to be passed in

* Throw errors in userVerificationService

* Use requestOTP in UserVerificationService

* Remove unused deps

* Fix linting

common/src/abstractions/userVerification.service.ts

@@ -6,4 +6,5 @@ export abstract class UserVerificationService {
     buildRequest: <T extends SecretVerificationRequest> (verification: Verification,
         requestClass?: new () => T, alreadyHashed?: boolean) => Promise<T>;
     verifyUser: (verification: Verification) => Promise<boolean>;
+    requestOTP: () => Promise<void>;
 }