fix(@angular-devkit/build-angular): correct esbuild builder global st…

…ylesheet sourcemap URL

The sourcemap URL in the output CSS files for global stylesheets is now correctly updated to
reflect the name of the global stylesheet output file and not the internal `stdin` virtual
file name.

(cherry picked from commit b647d80)

packages/angular_devkit/build_angular/src/builders/browser-esbuild/index.ts

@@ -386,10 +386,15 @@ async function bundleGlobalStylesheets(
     // with the actual name of the global style and the leading directory separator must
     // also be removed to make the path relative.
     const sheetPath = sheetResult.path.replace('stdin', name);
-    outputFiles.push(createOutputFileFromText(sheetPath, sheetResult.contents));
+    let sheetContents = sheetResult.contents;
     if (sheetResult.map) {
       outputFiles.push(createOutputFileFromText(sheetPath + '.map', sheetResult.map));
+      sheetContents = sheetContents.replace(
+        'sourceMappingURL=stdin.css.map',
+        `sourceMappingURL=${name}.css.map`,
+      );
     }
+    outputFiles.push(createOutputFileFromText(sheetPath, sheetContents));
 
     if (!noInjectNames.includes(name)) {
       initialFiles.push({