[browser][coreCLR] runtime pack

[pavelsavara]

• adds dummy version of clr.nativecorelib that just copies System.Private.CoreLib.dll to expected place
• adds PlatformManifestFileEntry for new libraries
• disabled PublishReadyToRun until [User Story] RyuJIT for WebAssembly (Wasm) #121141
• install static libraries into sharedFramework only in native cmake root. Otherwise those from coreclr tree are duplicates when we create runtime pack.

Fixes #120206

[Copilot]

Pull Request Overview

This PR adds CoreCLR WASM support to the runtime build system. The changes enable building CoreCLR for browser targets alongside the existing Mono support.

• Adds CORERUN_LIBS_ONLY conditional gates to prevent installing runtime-specific native libraries to the sharedFramework when building for test scenarios
• Includes CoreCLR WASM-specific native files in the platform manifest for browser targets
• Disables crossgen/R2R for browser/WASI targets and implements a copy-only strategy for CoreLib
• Updates the default CoreCLR subset for browser targets to include clr.nativecorelib
• Modifies CI pipeline to build packs in addition to clr+libs for WASM

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/native/libs/System.Native/CMakeLists.txt	Adds CORERUN_LIBS_ONLY guards around install commands for System.Native-Static and TimeZoneData libraries
src/native/libs/System.Native.Browser/CMakeLists.txt	Adds CORERUN_LIBS_ONLY guard around install command for System.Native.Browser-Static
src/native/libs/System.Globalization.Native/CMakeLists.txt	Adds CORERUN_LIBS_ONLY guards around install commands for globalization libraries and ICU files
src/native/libs/Common/JavaScript/CMakeLists.txt	Adds CORERUN_LIBS_ONLY guard around install commands for JavaScript rollup outputs
src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.CoreCLR.sfxproj	Disables PublishReadyToRun for browser and wasi targets
src/installer/pkg/sfx/Microsoft.NETCore.App/Directory.Build.props	Adds CoreCLR WASM-specific native library files to platform manifest entries
src/coreclr/crossgen-corelib.proj	Adds browser-specific target that copies CoreLib instead of running crossgen
eng/pipelines/runtime.yml	Updates browser_wasm build to include packs subset
eng/Subsets.props	Adds clr.nativecorelib to default CoreCLR subsets for browser targets

[maraf]

Changes look good to me

[pavelsavara]

/ba-g CI timeouts and #114924, filled #121344

[codesigner-ui]

how can I built the coreclr browser.wasm package, there are error on my local build.