[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 e_machine from the built player's ELF header to pick the arch. 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. This works on every Unity version without depending on the Linux module's editor API.

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.

Not verified yet: no arm64 player has been built. Two things need one real Linux Server arm64 build on 6000.3.16+:

• whether Unity's arm64 player resolves plugins from _Data/Plugins/arm64. The folder name is assumed, mirroring x86_64.
• that the player's ELF header reports EM_AARCH64. This is expected but hasn't been checked.

Closes #2466. Supersedes #2470.

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