Enable android-arm NativeAOT pack wiring

[simonrozsival]

Note

This PR is stacked on #11172 and should remain draft until the android-arm runtime dependencies are available.

Summary

Add the Android arm32 (android-arm / armeabi-v7a) NativeAOT runtime pack wiring on top of the CoreCLR android-arm enablement in #11172.

Changes

• Enable SupportNativeAOT=True for armeabi-v7a.
• Add the Microsoft.Android.Runtime.NativeAOT.37.android-arm workload manifest pack.
• Include armeabi-v7a in the native NativeAOT runtime build.
• Add NativeAOT CMake presets for armeabi-v7a.
• Add arm32 NativeAOT app-side NDK mappings, keeping clang wrapper prefix, sysroot ABI, and compiler-rt ABI separate for arm32.
• Include armeabi-v7a in xaprepare NativeAOT redist/sysroot preparation.

Status

This intentionally assumes the required NativeAOT linux-bionic-arm / Android arm32 runtime assets are available. CI may remain red until the dependent runtime/SDK changes flow.