Description of Change

Now that we have merged #28225, and soon will merge #28670, we can finally start getting rid of MeasureInvalidated event and also enhance some features.

• Removed Compatibility.Layout useless and harming code (causing additional unneeded invalidations/arranges)
• Moved ComputeConstraintForView from Compatibility.Layout to VisualElement so new layouts will be able to use it out of the box so that we can leverage Stop iOS SetNeedsLayout propagation by looking at VisualElement computed Constraint #28479
• Adds an app switch to disable MeasureInvalidated total propagation, basically "revert"s Make MeasureInvalidated event work correctly #23052 and goes back to 8.0.82 behavior where the propagation was happening only while using legacy layouts

/// <summary>
/// A flag that determines whether the measure invalidated event should not be propagated up the visual tree.
/// </summary>
/// <remarks>
/// Propagation will still occur within legacy layout subtrees.
/// </remarks>
internal static bool SkipMeasureInvalidatedPropagation { get; set /* for testing purpose */; } =
	AppContext.TryGetSwitch("Microsoft.Maui.RuntimeFeature.SkipMeasureInvalidatedPropagation", out var enabled) && enabled;

Issues Fixed

Fixes #25264