Add accessibility identifier to MauiDoneAccessoryView Done button for UI testing

[Copilot]

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Description of Change

The Done button in numeric keyboard's input accessory view was not accessible for UI testing due to missing accessibility identifier.

Changes:

• Set AccessibilityIdentifier = "Microsoft.Maui.Platform.MauiDoneAccessory.DoneButton" on UIBarButtonItem in both MauiDoneAccessoryView constructors
• Added UI test verifying Done button accessibility and tap behavior

Usage in tests:

App.WaitForElement("Microsoft.Maui.Platform.MauiDoneAccessory.DoneButton");
App.Tap("Microsoft.Maui.Platform.MauiDoneAccessory.DoneButton");

Issues Fixed

Fixes #32825

Original prompt

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This section details on the original issue you should resolve

<issue_title>Make MauiDoneAccessoryView DoneButton accessible</issue_title>
<issue_description>### Description

PR #24645 added a Done button to numeric entry's keyboard.

Currently it's not accessible because no Id is assigned.
IMHO Maui should set some Id(Microsoft.Maui.Platform.MauiDoneAccessory.DoneButton?) to enable UI-Tests

Steps to Reproduce

1. Add a Entry with numeric keyboard to a page
2. Inspect elements

Link to public reproduction project repository

No response

Version with bug

10.0.10

Is this a regression from previous behavior?

No, this is something new

Last version that worked well

No response

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

```</issue_description>

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

<comments>
</comments>

• Fixes Make MauiDoneAccessoryView DoneButton accessible #32825

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[jfversluis]

/azp run MAUI-UITests-public

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[Copilot]

Pull request overview

This PR adds an accessibility identifier to the Done button in iOS numeric keyboard's input accessory view to enable UI testing automation. The change addresses GitHub issue #32825 by adding the identifier "Microsoft.Maui.Platform.MauiDoneAccessory.DoneButton" to the UIBarButtonItem in both MauiDoneAccessoryView constructors and includes a comprehensive UI test to verify the functionality.

Key Changes

• Added accessibility identifier constant and assignment to UIBarButtonItems in MauiDoneAccessoryView
• Created UI test infrastructure to verify the Done button is accessible and functional
• Implemented test page with Entry control using numeric keyboard to demonstrate the feature

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Core/src/Platform/iOS/MauiDoneAccessoryView.cs	Added constant for automation ID and assigned it to Done button in both constructors
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/MauiDoneAccessoryButton.cs	NUnit UI test that verifies Done button accessibility and tap behavior
src/Controls/tests/TestCases.HostApp/Issues/MauiDoneAccessoryButton.cs	Test page with numeric Entry demonstrating Done button functionality

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[jfversluis]

Failing test unrelated