Suppress error from monaco-editor (#29684)

Fixes: #29414

I see no way for us to catch this error, so downgrade it until
microsoft/monaco-editor#4325 is fixed, which
will likely take a few weeks to propagate up from vscode.

The entries in `updates.config.js` will make
[`updates`](https://github.com/silverwind/updates) not upgrade these
anymore and I think it's good documentation as well to have the reasons
why we don't upgrade these dependencies.

Author: silverwind

web_src/js/bootstrap.js

@@ -6,10 +6,18 @@
 // This file must be imported before any lazy-loading is being attempted.
 __webpack_public_path__ = `${window.config?.assetUrlPrefix ?? '/assets'}/`;
 
+const filteredErrors = new Set([
+  'getModifierState is not a function', // https://github.com/microsoft/monaco-editor/issues/4325
+]);
+
 export function showGlobalErrorMessage(msg) {
   const pageContent = document.querySelector('.page-content');
   if (!pageContent) return;
 
+  for (const filteredError of filteredErrors) {
+    if (msg.includes(filteredError)) return;
+  }
+
   // compact the message to a data attribute to avoid too many duplicated messages
   const msgCompact = msg.replace(/\W/g, '').trim();
   let msgDiv = pageContent.querySelector(`.js-global-error[data-global-error-msg-compact="${msgCompact}"]`);