WebUI: Use ESLint checks to prevent @ts-ignore statements.

This is partially enforcing [1] from the TS styleguide. The new check is
disabled in a few folders that still exhibit such violations.

[1] https://google.github.io/styleguide/tsguide.html#ts-ignore

Bug: 40519637,346830791
Change-Id: I8bbf32b19a9cae87da31540c1abc04ac6f29caf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5628015
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1314729}

.eslintrc.js

@@ -291,6 +291,9 @@ module.exports = {
           },
         }
       }],
+
+      // https://google.github.io/styleguide/tsguide.html#ts-ignore
+      '@typescript-eslint/ban-ts-comment': ['error', {'ts-ignore': true}],
     }
   }]
 };

chrome/browser/resources/chromeos/.eslintrc.js

@@ -11,5 +11,8 @@ module.exports = {
 
     // Turn off since there are many violations in this folder.
     '@typescript-eslint/consistent-type-imports' : 'off',
+
+    // Turn off until violations in this folder are fixed.
+    '@typescript-eslint/ban-ts-comment' : 'off',
   },
 };

chrome/test/data/webui/side_panel/read_anything/.eslintrc.js

@@ -0,0 +1,10 @@
+// Copyright 2024 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module.exports = {
+  'rules' : {
+    // TODO(crbug.com/346830791): Fix all violations and re-enable.
+    '@typescript-eslint/ban-ts-comment' : 'off',
+  },
+};

ui/file_manager/file_manager/common/js/mock_chrome.ts

@@ -56,6 +56,7 @@ export class MockChromeFileManagerPrivateDirectoryChanged {
 
     window.chrome.fileManagerPrivate = window.chrome.fileManagerPrivate || {};
 
+    /* eslint-disable-next-line @typescript-eslint/ban-ts-comment */
     // @ts-ignore: The file_manager_private.d.ts don't allow to overwrite
     // `onDirectoryChanged`.
     window.chrome.fileManagerPrivate.onDirectoryChanged =