fix: Restrict continue comment to whitespace separated slashes (#321230)

extensions/javascript/javascript-language-configuration.json

@@ -242,8 +242,8 @@
 		},
 		// Add // when pressing enter from inside line comment
 		{
-			"beforeText": "(?<!\\\\|\\w:)\/\/\\s*\\S",
-			"afterText": "^(?!\\s*$).+",
+			"beforeText": "^\\s*//|\\s//\\s",
+			"afterText": "^(?!\\s*$)",
 			"action": {
 				"indent": "none",
 				"appendText": "// "