[Revert] Fix iOS ProgressBar bounding box

[SubhikshaSf4851]

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment whether this change resolves your issue. Thank you!

Description of Change

Reverts the iOS ProgressBar height-scaling behavior introduced in #35507.

That PR wrapped UIProgressView in a container and vertically scaled it to fill the MAUI-arranged height. While technically correct in isolation, this changes the cross-platform behavior:

• Before Fix iOS ProgressBar bounding box #35507: A ProgressBar assigned a parent height of 200 occupies the allocated 200px layout area, but the ProgressBar track is rendered at its native default height — consistent across iOS, Android, and Windows.
• After Fix iOS ProgressBar bounding box #35507: On iOS, the ProgressBar track is stretched to fill the full 200px height, which does not match Android or Windows behavior.

We also validated this in native iOS: when a height is assigned to the parent container, UIProgressView renders at its default intrinsic height and is not stretched — confirming that the previous MAUI behavior was the correct cross-platform baseline.

Impact

• All existing iOS ProgressBar device tests are failing after Fix iOS ProgressBar bounding box #35507.
• The ProgressBar_ProgressToMethod_VerifyVisualState test visually demonstrates the inconsistency (screenshots attached ).

Screenshots

Platform	Before #35507 (expected)	After #35507 (regression)
iOS
Mac
Windows		N/A
Android		N/A

cc : @AdamEssenmacher