fix(@angular/build): use date/time based output path for vitest unit-test

The output directory name for the unit-test code when using the
experimental `unit-test` builder with the `vitest` runner will now use
a value based on the date and time of test execution instead of only
a random UUID. This value improves the discoverability of a test execution
when multiple have been performed.

Author: clydin

packages/angular/build/src/builders/unit-test/builder.ts

@@ -113,7 +113,7 @@ export async function* execute(
     buildTargetOptions.polyfills.push('zone.js/testing');
   }
 
-  const outputPath = path.join(context.workspaceRoot, 'dist/test-out', randomUUID());
+  const outputPath = path.join(context.workspaceRoot, generateOutputPath());
   const buildOptions: ApplicationBuilderInternalOptions = {
     ...buildTargetOptions,
     watch: normalizedOptions.watch,
@@ -343,3 +343,10 @@ function setupBrowserConfiguration(
 
   return { browser };
 }
+
+function generateOutputPath(): string {
+  const datePrefix = new Date().toISOString().replaceAll(/[-:.]/g, '');
+  const uuidSuffix = randomUUID().slice(0, 8);
+
+  return path.join('dist', 'test-out', `${datePrefix}-${uuidSuffix}`);
+}