Avoid refreshing diagnostics for language servers that didn't update

Co-Authored-By: Max Brunsfeld <max@zed.dev>

crates/rpc/proto/zed.proto

@@ -516,8 +516,9 @@ message UpdateDiagnosticSummary {
 
 message DiagnosticSummary {
     string path = 1;
-    uint32 error_count = 2;
-    uint32 warning_count = 3;
+    uint64 language_server_id = 2;
+    uint32 error_count = 3;
+    uint32 warning_count = 4;
 }
 
 message UpdateLanguageServer {

crates/rpc/src/rpc.rs

@@ -6,4 +6,4 @@ pub use conn::Connection;
 pub use peer::*;
 mod macros;
 
-pub const PROTOCOL_VERSION: u32 = 22;
+pub const PROTOCOL_VERSION: u32 = 23;