PackageManagerUninstallValidator needs to use dependency injection to pass on 11.x

Looks great!

This matches the way Drupal core does things since 10.1 (constructor with many arguments spread across many lines, use private readonly when appropriate).

All unit tests passed, 90% of kernel tests have, so assuming this hits 100% green test results, I think this is ready 😊

Automatically closed - issue fixed for 2 weeks with no activity.