[iOS][NativeAOT] Stand up testing on devices

[ivanpovazan]

Description

With #19194 we started testing NativeAOT iOS support with MAUI on CI.
However, added tests are only testing building MAUI iOS template applications.
In order to have a better test coverage we should stand up running NativeAOT iOS tests on devices as well.

Tasks

This effort should cover at least the following:

• [iOS][NativeAOT] Adding NativeAOT RunOniOS device test #19923
• [Testing] NativeAOT: Stand up UI testing on iOS platforms #20541
• [Testing] NativeAOT: Controls.Sample.UITests - Issue* UI tests are not compatible with NativeAOT #20553
• Stand up running Core.DeviceTests.csproj tests with NativeAOT https://github.com/dotnet/maui/blob/main/src/Core/tests/DeviceTests/Core.DeviceTests.csproj
• Stand up real-world app testing (eg: Recipes or eShop)

[ivanpovazan]

/cc: @jonathanpeppers @simonrozsival
We should discuss what will fall into TBD - Additional relevant testing but feel free to extend the list as you see fit.

[ivanpovazan]

Regarding:

Stand up running Core.DeviceTests.csproj tests with NativeAOT

In order to adapt these tests to execute with NativeAOT, we will need to adapt/change HeadlessTestRunner

maui/src/TestUtils/src/DeviceTests.Runners/HeadlessRunner/iOS/HeadlessTestRunner.cs

Line 13 in c20f10d

class HeadlessTestRunner : iOSApplicationEntryPoint

as it inherits XHarness.TestRunners.Xunit test runner. The problem with this type of runners, is that it expects assemblies to be present on disk in order to load them and find relevant test cases. This is not supported by NativeAOT as the managed assemblies are not preserved during deployment.

• As a short-term solution/workaround, we could potentially create a NativeAOT variant of HeadlessTestRunner which resembles single file test runner (similar we are using in dotnet/runtime)
• As a long-term solution, we should create an AOT-compatible XUnit test runner: Add AOT-compatible XUnit runner runtime#91069