refactor: move "Parsing error" prefix adding to Linter (#18650)

Author: mdjermanovic

lib/languages/js/index.js

@@ -200,7 +200,7 @@ module.exports = {
         } catch (ex) {
 
             // If the message includes a leading line number, strip it:
-            const message = `Parsing error: ${ex.message.replace(/^line \d+:/iu, "").trim()}`;
+            const message = ex.message.replace(/^line \d+:/iu, "").trim();
 
             debug("%s\n%s", message, ex.stack);
 

lib/linter/linter.js

@@ -941,7 +941,7 @@ function parse(file, language, languageOptions) {
             nodeType: null,
             fatal: true,
             severity: 2,
-            message: error.message,
+            message: `Parsing error: ${error.message}`,
             line: error.line,
             column: error.column
         }))