[clr-ios] Improve inner dev loop on Apple mobile platforms with CoreCLR and Interpreter

[kotlarmilos]

Description

There are three scenarios of interest for non-Release builds:

• First build
• Incremental build
• Hot reload

The first build can be improved by enabling trimming and reducing the binary size like dotnet/maui#34107. The ILLink and R2R tasks must run completely to generate the app bundle.

The two main contributors of the incremental build are ILLink (50%) and R2R (40%). The goal is to avoid unnecessary R2R targets. If an assembly is a user assembly and was not part of an R2R image, caching of the R2R output should be implemented.

Tasks

• [net11.0] Cache R2R image when only user assemblies are changed macios#24735
• Fix ExcludeList handling in composite R2R and correct entry-point assembly metadata sdk#53084

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