[bitsandfoxes]

Linux dedicated servers built for ARM64 (Unity 6000.3+, IL2CPP) now get the native SDK. Both Linux backends (Breakpad and native) are built for x86_64 and ARM64 into matching subfolders of Plugins/Linux/Sentry~ and SentryNative~, the same way Windows ships x86/x64. CI builds the ARM64 libraries on ubuntu-22.04-arm to keep the glibc floor low.

Both architectures build for StandaloneLinux64, so BuildPostProcess reads the target architecture from UnityEditor.LinuxStandalone.UserBuildSettings.architecture, the same setting Unity's own Linux build uses to pick the player. It lives in the Linux module's assembly, so it's read via reflection and falls back to x86_64 on versions without ARM64 support. That arch decides which libraries get copied, which plugin dir they land in (<Player>_Data/Plugins/<arch>), which stale artifacts get cleaned up, and which .dbg sidecars get uploaded.

The subfolders are named after Unity's plugin CPU names (x86_64, ARM64), which is what Unity itself uses for <Player>_Data/Plugins/<CPU>. One name serves both the package and the player, with no mapping.

Since #2708 the Linux libs live in hidden ~ folders and are copied after the build, so the PluginImporter collision in UUM-131765 doesn't apply here and no Unity patch-version gate is needed.

CI

A new ARM64 integration test sits next to the Windows x86 one: one Unity version (the newest in the matrix, skipped below 6000.3), native backend only. The x86_64 matrix already covers the version spread and Breakpad.

• Build on ubuntu-24.04: Unity has no ARM64 Linux editor and the GameCI images lack the ARM64 server player, so setup-unity.ps1 (now with the Linux x64 Unity CLI) installs Unity with the linux-server module and cross-compiles. The job asserts the player is aarch64.
• Run on ubuntu-24.04-arm, without xvfb-run since the dedicated server is headless.

Closes #2466. Supersedes #2470.

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