Improve Linux panic reporting (#22202)

- [x] Upload separate debug symbols for Linux binaries to DigitalOcean
- [x] Send raw offsets with panic report JSON on Linux
- [x] Update `symbolicate` script to handle Linux crashes
- [x] Demangle backtraces 🎉 
- [x] Check that it works
- [x] Improve deduplication (?)
 
Release Notes:

- N/A

---------

Co-authored-by: Conrad <conrad@zed.dev>

crates/remote_server/src/unix.rs

@@ -160,6 +160,7 @@ fn init_panic_hook() {
                 option_env!("ZED_COMMIT_SHA").unwrap_or(&env!("ZED_PKG_VERSION"))
             ),
             release_channel: release_channel::RELEASE_CHANNEL.display_name().into(),
+            target: env!("TARGET").to_owned().into(),
             os_name: telemetry::os_name(),
             os_version: Some(telemetry::os_version()),
             architecture: env::consts::ARCH.into(),