fix(@angular/build): ensure correct project targeting during Vitest debugging

This addresses issue angular#31652 where debugging failed to target the correct project instance. When running browser tests, Vitest appends the browser name to the project identifier. This change updates the CLI to match that naming convention when initiating a debug session, ensuring the correct project is selected.

Fixes angular#31652

Author: clydin

packages/angular/build/src/builders/unit-test/runners/vitest/executor.ts

@@ -215,7 +215,10 @@ export class VitestExecutor implements TestExecutor {
       {
         config: externalConfigPath,
         root: workspaceRoot,
-        project: projectName,
+        project:
+          debug && browserOptions.browser?.instances
+            ? `${projectName} (${browserOptions.browser.instances[0].browser})`
+            : projectName,
         outputFile,
         cache: cacheOptions.enabled ? undefined : false,
         testNamePattern: this.options.filter,