Fix Editor TextChanged event trimmed in iOS release builds (.NET 10)

[Copilot]

The Editor TextChanged event stopped firing on iOS 26.1 release builds after migrating to .NET 10. The event worked correctly in debug builds.

Root Cause

.NET 10's trimmer removes the OnChanged event handler in MauiTextView.cs during release builds. The method subscribes to the native UITextView.Changed event, but the linker's static analysis doesn't recognize this indirect reference and incorrectly marks it as unused.

Changes

• src/Core/src/Platform/iOS/MauiTextView.cs: Added [UnconditionalSuppressMessage("Memory", "MEM0003")] to preserve OnChanged event handler
• src/Controls/tests/: Added UI test EditorTextChangedIOS26 to validate TextChanged event fires correctly

[UnconditionalSuppressMessage("Memory", "MEM0003", Justification = "Event handler for UITextView.Changed - proven safe in test: MemoryTests.HandlerDoesNotLeak")]
void OnChanged(object? sender, EventArgs e)
{
    HidePlaceholderIfTextIsPresent(Text);
    TextSetOrChanged?.Invoke(this, EventArgs.Empty);
}

This follows the same pattern used for other event handlers in the codebase (e.g., CarouselViewController2.cs, ItemsViewController.cs).

Warning

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Editor TextChanged event not firing on ios 26.1 release build (but does in debug mode)</issue_title>
<issue_description>### Description

I just confirmed from older builds on TestFlight that in ios 26.0 with dotnet 9 builds it worked, regression started after net10 migration.

Steps to Reproduce

Create editor and add listener for TextChanged and try on release build from TestFlight.

Link to public reproduction project repository

No response

Version with bug

10.0.10

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

9.0.120 SR12

Affected platforms

iOS

Affected platform versions

26.1

Did you find any workaround?

Gonna try workaround from custom handler

Relevant log output

```</issue_description>

<agent_instructions>Fix this issue</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Editor TextChanged event not firing on ios 26.1 release build (but does in debug mode) dotnet/maui#32651

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