lsp: Pass back diagnostic .data when querying code actions for it (#14962)

Per the LSP spec, we should pass .data field of diagnostics into code
action request:
```
	/**
	 * A data entry field that is preserved between a
	 * `textDocument/publishDiagnostics` notification and
	 * `textDocument/codeAction` request. *
	 * @since 3.16.0 */ data?: LSPAny;
```


Release Notes:

- Fixed rare cases where a code action triggered by diagnostic may not
be available for use.

crates/proto/proto/zed.proto

@@ -1890,6 +1890,7 @@ message Diagnostic {
         Information = 3;
         Hint = 4;
     }
+    optional string data = 12;
 }
 
 message Operation {