Picker's SelectedIndexChanged event run infinitely when changing ControlTemplate

### Description

I want to change the `ControlTemplate` of a content page based on Selected Index in Picker. But the program hangs and the `SelectedIndexChanged` event get called infinitely. I don't know whether this is an issue in picker , in control Template or combination of both. But changing the Selected Index without the ControlTemplate change logic does not cause this issue.

### Steps to Reproduce

Run the Repro project and change the Selected Index of the Picker.

https://github.com/HobDev/MauiBugs/tree/PickerIssue

### Version with bug

6.0.408 (current)

### Last version that worked well

Unknown/Other

### Affected platforms

Android, I was *not* able test on other platforms

### Affected platform versions

Android 11

### Did you find any workaround?

_No response_

### Relevant log output

_No response_

Start by running the linked PickerIssue repro on Android 11 with .NET MAUI 6.0.408 and changing the Picker's selected index. Then trace the interaction between SelectedIndexChanged and the ControlTemplate change. Done means identifying the recurring event path and verifying that changing the index no longer hangs the app.

Written by the indexing model from the issue text.