build: remove useless source-map-loader to speedup webpack (#4910)

packages/frontend/core/.webpack/config.ts

@@ -22,7 +22,7 @@ import { WebpackS3Plugin, gitShortHash } from './s3-plugin.js';
 
 const IN_CI = !!process.env.CI;
 
-export const rootPath = fileURLToPath(new URL('..', import.meta.url));
+export const rootPath = join(fileURLToPath(import.meta.url), '..', '..');
 const workspaceRoot = join(rootPath, '..', '..', '..');
 
 const require = createRequire(rootPath);
@@ -228,17 +228,6 @@ export const createConfiguration: (
       rules: [
         {
           test: /\.m?js?$/,
-          enforce: 'pre',
-          use: [
-            {
-              loader: require.resolve('source-map-loader'),
-              options: {
-                filterSourceMappingUrl: (_url: string) => {
-                  return false;
-                },
-              },
-            },
-          ],
           resolve: {
             fullySpecified: false,
           },