chore(vscode): update to 1.53.2

These conflicts will be resolved in the following commits. We do it this way so
that PR review is possible.

lib/vscode/src/vs/editor/common/modes/modesRegistry.ts

@@ -58,11 +58,12 @@ export const ModesRegistry = new EditorModesRegistry();
 Registry.add(Extensions.ModesRegistry, ModesRegistry);
 
 export const PLAINTEXT_MODE_ID = 'plaintext';
+export const PLAINTEXT_EXTENSION = '.txt';
 export const PLAINTEXT_LANGUAGE_IDENTIFIER = new LanguageIdentifier(PLAINTEXT_MODE_ID, LanguageId.PlainText);
 
 ModesRegistry.registerLanguage({
 	id: PLAINTEXT_MODE_ID,
-	extensions: ['.txt'],
+	extensions: [PLAINTEXT_EXTENSION],
 	aliases: [nls.localize('plainText.alias', "Plain Text"), 'text'],
 	mimetypes: ['text/plain']
 });