remove unused eslint plugin, run eslint --fix, rollback node memory workaround in ci

src/utils/error.ts

@@ -1,6 +1,6 @@
-export type MatrixError = {
-	errcode: string;
-	error: string;
+export interface MatrixError {
+  errcode: string;
+  error: string;
 }
 
-export const displayError = (errcode: string, status: number, message: string) => `${errcode} (${status}): ${message}`;
+export const displayError = (errcode: string, status: number, message: string) => `${errcode} (${status}): ${message}`;