fix(@angular/build): add timestamp to bundle generation log

Adds an ISO timestamp to the "Application bundle generation complete" message. This provides more precise information about when the build process finished, which can be useful for debugging and analyzing build performance.

Closes #30572

(cherry picked from commit 43fc553)

Author: alan-agius4

packages/angular/build/src/builders/application/index.ts

@@ -109,7 +109,8 @@ export async function* buildApplicationInternal(
         const hasError = result.errors.length > 0;
 
         result.addLog(
-          `Application bundle generation ${hasError ? 'failed' : 'complete'}. [${buildTime.toFixed(3)} seconds]\n`,
+          `Application bundle generation ${hasError ? 'failed' : 'complete'}.` +
+            ` [${buildTime.toFixed(3)} seconds] - ${new Date().toISOString()}\n`,
         );
       }