Show when build scripts fail what the errors were

Author: alibektas

src/tools/rust-analyzer/crates/rust-analyzer/src/reload.rs

@@ -139,9 +139,10 @@ impl GlobalState {
                 "Proc-macros and/or build scripts have changed and need to be rebuilt.\n\n",
             );
         }
-        if self.fetch_build_data_error().is_err() {
-            status.health |= lsp_ext::Health::Warning;
+        if let Err(build_data_err) = self.fetch_build_data_error() {
+            status.health |= lsp_ext::Health::Error;
             message.push_str("Failed to run build scripts of some packages.\n\n");
+            format_to!(message, "{build_data_err}\n");
         }
         if let Some(err) = &self.config_errors {
             status.health |= lsp_ext::Health::Warning;