[clr-ios] Add R2R and interpreter functional tests on iOS

[kotlarmilos]

Description

This PR adds two smoke functional tests - one for R2R and one for the interpreter.

[Copilot]

Pull request overview

This PR adds two smoke functional tests for iOS CoreCLR: one for Ready-to-Run (R2R) and one for the interpreter. The changes include creating new test project files, a shared test program, and consolidating R2R configuration properties to make them reusable across Apple platform builds.

Key changes:

• New R2R and interpreter test projects in src/tests/FunctionalTests/iOS/Device/CoreCLR/
• Consolidation of R2R properties (PublishReadyToRunComposite and PublishReadyToRunContainerFormat) from mono/sample/iOS/Program.csproj to AppleBuild.props for reusability
• Updated test project paths in tests.proj from Simulator to Device directory

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
iOS.Simulator.CoreCLR.R2R.csproj	New R2R test project with PublishReadyToRun enabled and proper CrossGen2 imports
iOS.Simulator.CoreCLR.Interpreter.Test.csproj	Modified interpreter test project with environment variable removed
Program.cs	New simple smoke test program that returns exit code 42
mono/sample/iOS/Program.csproj	R2R properties moved to AppleBuild.props for better reusability
AppleBuild.props	Added centralized R2R properties for CoreCLR on Apple platforms
tests.proj	Updated test paths from Simulator/CoreCLR.Interpreter to Device/CoreCLR

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