refactor(core): Switch plain errors in cli to ApplicationError (#7857)

Ensure all errors in `cli` are `ApplicationError` or children of it and
contain no variables in the message, to continue normalizing all the
errors we report to Sentry

Follow-up to: https://github.com/n8n-io/n8n/pull/7839

packages/cli/src/UserManagement/email/UserManagementMailer.ts

@@ -6,6 +6,7 @@ import { Container, Service } from 'typedi';
 import config from '@/config';
 import type { InviteEmailData, PasswordResetData, SendEmailResult } from './Interfaces';
 import { NodeMailer } from './NodeMailer';
+import { ApplicationError } from 'n8n-workflow';
 
 type Template = HandlebarsTemplateDelegate<unknown>;
 type TemplateName = 'invite' | 'passwordReset';
@@ -50,7 +51,7 @@ export class UserManagementMailer {
 	}
 
 	async verifyConnection(): Promise<void> {
-		if (!this.mailer) throw new Error('No mailer configured.');
+		if (!this.mailer) throw new ApplicationError('No mailer configured.');
 
 		return this.mailer.verifyConnection();
 	}