test: add Android integration tests for IME engine queries

[Dor-bl]

GetIMEAvailableEngines had no test coverage anywhere in the suite. These tests exercise it against the emulator and assert the extracted engine ids are usable strings, plus that the active engine reported by GetIMEActiveEngine is one of the available ones.

Picked up by the existing FullyQualifiedName~Android filter in the functional test workflow, so no CI changes are needed.

List of changes

This pull request adds a new integration test class for Android IME (Input Method Editor) functionality. The new tests verify that the driver can correctly retrieve available IME engines and the currently active engine on an Android device.

New Android IME integration tests:

• Added ImeTest class in test/integration/Android/ImeTest.cs to test IME functionality using the Appium Android driver.
  • Includes setup and teardown for driver initialization and cleanup.
  • Adds a test to verify that GetIMEAvailableEngines returns a non-empty list of installed IME engines.
  • Adds a test to ensure the active IME engine is among the available engines.

Types of changes

What types of changes are you proposing/introducing to the .NET client?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change that adds functionality or value)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)
• Test fix (non-breaking change that improves test stability or correctness)
• Chore/Maintenance (updates to build scripts, dependencies, or GitHub Actions)

Documentation

• Have you proposed a file change/ PR with Appium to update documentation?

This can be done by navigating to the documentation section on http://appium.io selecting the appropriate command/endpoint and clicking the 'Edit this doc' link to update the C# example

Integration tests

• Have you provided integration tests for your changes? (required for Bugfix, New feature, or Test fix)

Details

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[Copilot]

Pull request overview

Adds Android integration test coverage for the Appium IME (Input Method Editor) APIs, ensuring GetIMEAvailableEngines and GetIMEActiveEngine are exercised against a real/emulated Android environment and validating basic invariants about the returned engine identifiers.

Changes:

• Added a new Android integration test fixture validating GetIMEAvailableEngines returns a non-empty list of non-blank engine IDs.
• Added an Android integration test asserting the active IME engine returned by GetIMEActiveEngine is included in the available engines list.
• Added one-time setup/teardown to create and dispose an AndroidDriver session for these tests.

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