Use getErrorMessage in log too

src/database-upload.test.ts

@@ -231,7 +231,7 @@ test("Don't crash if uploading a database fails", async (t) => {
         (v) =>
           v.type === "warning" &&
           v.message ===
-            "Failed to upload database for javascript: Error: some error message",
+            "Failed to upload database for javascript: some error message",
       ) !== undefined,
     );
   });

src/database-upload.ts

@@ -138,7 +138,9 @@ export async function cleanupAndUploadDatabases(
       }
     } catch (e) {
       // Log a warning but don't fail the workflow
-      logger.warning(`Failed to upload database for ${language}: ${e}`);
+      logger.warning(
+        `Failed to upload database for ${language}: ${util.getErrorMessage(e)}`,
+      );
       reports.push({
         language,
         error: util.getErrorMessage(e),