[Testing] Run UI tests with CoreCLR on Android

[rmarinho]

Description of Change

Add UITests stage for using CoreCLR, enable NativeAOT for UITEsts.

This pull request introduces support for the CoreCLR runtime variant, refactors build and test scripts for better maintainability, and updates the pipeline configurations. The most significant changes include adding CoreCLR as a runtime option, enhancing build tasks to accommodate the new runtime, and updating pipeline files to support CoreCLR-specific builds and tests.

Seems we weren't actually build also the NativeAOT uitest step correctly, so fixing that too on this PR.

CoreCLR Runtime Support:

• Added CoreCLR as a new runtime variant in the RuntimeVariant enum and introduced a corresponding flag USE_CORECLR in eng/cake/dotnet.cake.
• Updated the Task("uitests-apphost") to include CoreCLR-specific build properties, such as UseMonoRuntime and TargetFramework.

Build Script Refactoring:

• Introduced DefaultDotnetVersion to support dynamic target framework versions via arguments or environment variables.
• Standardized formatting and improved readability across multiple tasks, such as dotnet, dotnet-local-workloads, and dotnet-samples. [1] [2] [3]
• Enhanced exception handling and formatting in the GenerateCgManifest task and RunTestWithLocalDotNet method. [1] [2]

Pipeline Updates:

• Modified ui-tests-build-sample.yml to include CoreCLR as a runtime variant and added conditions for publishing CoreCLR-specific artifacts. [1] [2]
• Added CoreCLR-specific stages and jobs in ui-tests.yml for both build and test workflows. [1] [2]
• Updated the macOS version to macOS-15 and Android API levels to 36 in ui-tests.yml. [1] [2]

Project Configuration:

• Suppressed additional warnings (IL2026, IL2091, etc.) in the Controls.TestCases.HostApp.csproj file to address compatibility issues.

Issues Fixed

Fixes #30278

[Copilot]

Pull Request Overview

This pull request introduces CoreCLR runtime support to the .NET MAUI UI testing infrastructure. The changes enable building and testing MAUI applications using the CoreCLR runtime alongside the existing Mono and NativeAOT variants.

Key changes include:

• Added CoreCLR as a new runtime variant in build and pipeline configurations
• Enhanced UI test pipelines to support CoreCLR-specific build and test stages
• Updated build infrastructure to handle CoreCLR-specific properties and configurations

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Controls.TestCases.HostApp.csproj	Added warning suppressions for IL analyzer warnings
ui-tests.yml	Updated macOS version and Android API levels for test environments
ui-tests.yml (common)	Added CoreCLR build and test stages for Android UI tests
ui-tests-steps.yml	Added artifact download step for CoreCLR test samples
ui-tests-build-sample.yml	Added CoreCLR-specific artifact publishing conditions
dotnet.cake	Implemented CoreCLR runtime variant support and build configuration

Comments suppressed due to low confidence (1)

src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj:26

• Adding new warning suppressions (IL2026, IL2091, IL2067, IL2072, IL2087, IL3050) without corresponding test cases. These IL analyzer warnings are related to trimming and AOT compatibility. Please ensure there are test cases in TestCases.Shared.Tests that verify the behavior when these warnings would normally be triggered, particularly for CoreCLR scenarios.

    <NoWarn>$(NoWarn);CS0618;CS0672;XC0618;XC0022;XC0023;IL2026;IL2091;IL2067;IL2072;IL2087;IL3050</NoWarn>

[rmarinho]

Since this was not running with NAtiveAOT it was throwing the errors.

[rmarinho]

/rebase

[rmarinho]

/rebase

[rmarinho]

/rebase