Fixes buggy onEnter behavior when used with generator method (#100076)

* Adds regex to ignore already closed comment block

* Adds test case for generator method onEnter buggy behavior

extensions/typescript-language-features/src/features/languageConfiguration.ts

@@ -31,7 +31,7 @@ const jsTsLanguageConfiguration: vscode.LanguageConfiguration = {
 		}, {
 			// e.g.  * ...|
 			beforeText: /^(\t|[ ])*[ ]\*([ ]([^\*]|\*(?!\/))*)?$/,
-			oneLineAboveText: /^(\s*(\/\*\*|\*)).*/,
+			oneLineAboveText: /(?=^(\s*(\/\*\*|\*)).*)(?=(?!(\s*\*\/)))/,
 			action: { indentAction: vscode.IndentAction.None, appendText: '* ' },
 		}, {
 			// e.g.  */|