chore: Ran quality checks and license checks, b=no-bug, c=winsign, workspaces

eslint.config.mjs

@@ -1,3 +1,7 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 import js from '@eslint/js';
 import globals from 'globals';
 import { defineConfig } from 'eslint/config';