[ci] Add integration test stage to dnceng/public

[pjcollins]

An Integration test stage has been added to the dnceng/public build.
This should be the last piece needed to mirror the existing MAUI public
PR build in xamarin/public.

Some adjustments have been made to the Android emulator creation and
launch process to improve the performance on the default hosted macOS
images. A SDK license acceptance workflow has also been added to fix
AVD installation in certain cases.

[Copilot]

Copilot reviewed 5 out of 12 changed files in this pull request and generated 2 comments.

Files not reviewed (7)

• src/TestUtils/src/Microsoft.Maui.IntegrationTests/Utilities/ToolRunner.cs: Evaluated as low risk
• eng/pipelines/common/variables.yml: Evaluated as low risk
• eng/pipelines/arcade/stage-unit-tests.yml: Evaluated as low risk
• eng/pipelines/arcade/stage-pack.yml: Evaluated as low risk
• src/TestUtils/src/Microsoft.Maui.IntegrationTests/AndroidTemplateTests.cs: Evaluated as low risk
• src/TestUtils/src/Microsoft.Maui.IntegrationTests/Android/Adb.cs: Evaluated as low risk
• src/TestUtils/src/Microsoft.Maui.IntegrationTests/Utilities/TestEnvironment.cs: Evaluated as low risk

Comments suppressed due to low confidence (3)

eng/pipelines/common/setup-android-dependencies.yml:12

• [nitpick] The temporary project directory name 'TempDroid' is not very descriptive. Consider renaming it to something more descriptive like 'TemporaryAndroidProject'.

arguments: android -o $(Agent.TempDirectory)/TempDroid

src/TestUtils/src/Microsoft.Maui.IntegrationTests/Android/Emulator.cs:21

• The new AcceptLicenses method should be covered by tests to ensure it works as expected.

public bool AcceptLicenses(out string acceptLicenseOutput)

src/TestUtils/src/Microsoft.Maui.IntegrationTests/Android/Emulator.cs:39

• The increased timeout for InstallAvd should be covered by tests to ensure it does not cause unintended side effects.

installOutput = ToolRunner.Run(SdkManagerTool, $"\"{SystemImageId}\"", out int exitCode, timeoutInSeconds: 180);

[Copilot]

This line introduces a potential breaking change if REQUIRED_XCODE is not defined or if the specified Xcode version is not available. Ensure that REQUIRED_XCODE is properly defined and the specified Xcode version is available on the build agents.