[clr-ios] Update iOS SDK build to run CoreCLR interpreter

[kotlarmilos]

Description

Add MSBuild properties and targets in the iOS SDK to enable running apps with the CoreCLR interpreter, dynamically linking the CoreCLR runtime and interpreter.

Tasks

• Add UseMonoRuntime=false property to select CoreCLR interpreter
• Update targets to dynamically link libcoreclr.dylib and the interpreter
• Ensure dotnet publish -r ios-arm64 -c Release /p:UseMonoRuntime=false produces an app configured for the CoreCLR interpreter
• Validate restore/build/publish flows in Debug/Release and device/simulator

DoD: Apps targeting iOS run successfully with the CoreCLR interpreter.

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