fix(core): Make email for UM case insensitive (#3078)

* 🚧 lowercasing email

* ✅ add tests for case insensitive email

* 🐘 add migration to lowercase email

* 🚚 rename migration

* 🐛 fix package.lock

* 🐛 fix double import

* 📋 add todo

packages/cli/src/databases/mysqldb/migrations/1648740597343-LowerCaseUserEmail.ts

@@ -0,0 +1,17 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+import config = require('../../../../config');
+
+export class LowerCaseUserEmail1648740597343 implements MigrationInterface {
+	name = 'LowerCaseUserEmail1648740597343';
+
+	public async up(queryRunner: QueryRunner): Promise<void> {
+		const tablePrefix = config.get('database.tablePrefix');
+
+		await queryRunner.query(`
+			UPDATE ${tablePrefix}user
+			SET email = LOWER(email);
+		`);
+	}
+
+	public async down(queryRunner: QueryRunner): Promise<void> {}
+}