WorkManager not working when app is killed

### Version Information

- Visual Studio version: 8.10.4 (build 11)
- Xamarin.Android version: 11.3.0.4 (Visual Studio Community)
- Using AndroidX or Support Libraries: Xamarin.AndroidX.Work.Runtime (2.5.0.2)

### Describe your Issue:

Im trying to setup a WorkManager that executes a task every 15 minutes. For now I'm doing this test adding an entry in a firebase database.

I'm using the nuget package Xamarin.AndroidX.Work.Runtime (2.5.0.2)

This works fine if the app is in foreground or background, but if I kill the app it stops working.

I'm doing this test with a Nokia 8 Sirocco (api 28) and with a Samsung Galaxy A21S (api 30) that both mount Android Stock.

This is how I launch the work:

```
private void StartParallelWorkManager(int minutes)
{
PeriodicWorkRequest taskLauncher = PeriodicWorkRequest.Builder.From(TimeSpan.FromMinutes(minutes)).Build();
WorkManager.GetInstance(Xamarin.Essentials.Platform.AppContext).EnqueueUniquePeriodicWork("TestTask", ExistingPeriodicWorkPolicy.Keep, taskLauncher);
}
```

and this is my Worker class:

```
public class UniquePeriodicWorker : Worker
{
public UniquePeriodicWorker(Context context, WorkerParameters workerParameters) : base(context, workerParameters)
{
}

public override Result DoWork()
{

System.Console.WriteLine("{0} DO WORK", DateTime.Now.ToString("dd/MM HH:mm:ss"));
try
{
_ = CrossCloudFirestore.Current
.Instance
.Collection("WorkManagerRuns")
.AddAsync(DateTime.Now);
}
catch(Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex);
}
return Result.InvokeSuccess();
}
}
```

**Doing the same test in android studio (using Kotlin) works like a charm.**

Am I missing something in Xamarin side or Xamarin.AndroidX.Work.Runtime is not capable to achieve the same behavior of the native equivalent??