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>

script/bundle-linux

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 
 set -euxo pipefail
+source script/lib/blob-store.sh
 
 # Function for displaying help info
 help_info() {
@@ -61,12 +62,24 @@ if [[ "$remote_server_triple" == "$musl_triple" ]]; then
 fi
 cargo build --release --target "${remote_server_triple}" --package remote_server
 
-# Strip the binary of all debug symbols
-# Later, we probably want to do something like this: https://github.com/GabrielMajeri/separate-symbols
-strip --strip-debug "${target_dir}/${target_triple}/release/zed"
-strip --strip-debug "${target_dir}/${target_triple}/release/cli"
-strip --strip-debug "${target_dir}/${remote_server_triple}/release/remote_server"
+# Strip debug symbols and save them for upload to DigitalOcean
+objcopy --only-keep-debug "${target_dir}/${target_triple}/release/zed" "${target_dir}/${target_triple}/release/zed.dbg"
+objcopy --only-keep-debug "${target_dir}/${remote_server_triple}/release/remote_server" "${target_dir}/${remote_server_triple}/release/remote_server.dbg"
+objcopy --strip-debug "${target_dir}/${target_triple}/release/zed"
+objcopy --strip-debug "${target_dir}/${target_triple}/release/cli"
+objcopy --strip-debug "${target_dir}/${remote_server_triple}/release/remote_server"
 
+gzip "${target_dir}/${target_triple}/release/zed.dbg"
+upload_to_blob_store_public \
+    "zed-debug-symbols" \
+    "${target_dir}/${target_triple}/release/zed.dbg.gz" \
+    "$channel/zed-$version-${target_triple}.dbg.gz"
+
+gzip "${target_dir}/${remote_server_triple}/release/remote_server.dbg"
+upload_to_blob_store_public \
+    "zed-debug-symbols" \
+    "${target_dir}/${remote_server_triple}/release/remote_server.dbg.gz" \
+    "$channel/remote_server-$version-${remote_server_triple}.dbg.gz"
 
 # Ensure that remote_server does not depend on libssl nor libcrypto, as we got rid of these deps.
 if ldd "${target_dir}/${remote_server_triple}/release/remote_server" | grep -q 'libcrypto\|libssl'; then