chore: disable eslint error/warning of ts-ignore in spec files, for now

backend/.eslintrc

@@ -100,7 +100,8 @@
 			"rules": {
 				"no-unused-expressions": "off",
 				"prefer-arrow-callback": "off",
-				"func-names": "off"
+				"func-names": "off",
+				"@typescript-eslint/ban-ts-comment": "off"
 			}
 		}
 	]