Picker control does not respect size imposed by parent.

### Description

The Picker control does not limit its size to the limits specified by its parent. It should never become larger than the size allotted to it, but it does if the selected item text does not fit into the allotted size. In XF this did not happen so this appears to be a regression.

When the selected item text does not fit into the allotted size, then ellipses or truncation should be used to prevent increasing the control size. Under some circumstances, Android does proper sizing of the Picker and truncates the text, but I could not make that work in the repro either.

Additionally, using the middle "*" column has an even stranger effect of apparently making the middle column width negative (the Pickers moves to the left). Also depending on the parent layout the Picker can overextend to the left or to the right.

### Steps to Reproduce

1. Build and run the repro sample under Android and iOS
2. On both platforms the white Picker control extends beyond the bounds of the parents:

[layoutbug13.zip](https://github.com/dotnet/maui/files/8705054/layoutbug13.zip)

### Version with bug

Release Candidate 3 (current)

### Last version that worked well

Unknown/Other

### Affected platforms

iOS, Android

### Affected platform versions

Android 11, iOS 15

### Did you find any workaround?

no

### Relevant log output

_No response_