fix(angular-standalone): enable auto import for angular standalone

[luisbytes]

Fix #1873

In the Angular standalone starter, the auto import feature in VS Code was not working for Ionic components.

This was caused by the .vscode/settings.json configuration, which excluded "@ionic/angular" entirely from typescript.preferences.autoImportFileExcludePatterns.

That exclusion prevented VS Code from suggesting imports not only from the barrel file (@ionic/angular), but also from subpaths such as:

import { IonButton } from '@ionic/angular/standalone';

What’s changed

Instead of excluding the entire @ionic/angular package, this PR refines the exclusion list after reviewing the barrel file to identify which internal paths are actually re-exported.
As a result, only those specific internal paths are excluded:

"typescript.preferences.autoImportFileExcludePatterns": [
  "@ionic/angular/common",
  "@ionic/angular/directives",
  "@ionic/angular/index.d.ts",
  "@ionic/angular/providers"
]

Result

Auto import in VS Code now correctly works for:

import { IonButton } from '@ionic/angular/standalone';

while still preventing imports from the internal subpaths of @ionic/angular.