fix: use designated initializer for Error to satisfy clang-tidy

Author: shangxinli

src/iceberg/test/expire_snapshots_test.cc

@@ -117,8 +117,8 @@ TEST_F(ExpireSnapshotsTest, FinalizeSkippedOnCommitError) {
   EXPECT_EQ(result.snapshot_ids_to_remove.size(), 1);
 
   // Simulate a commit failure - Finalize should not delete any files
-  auto finalize_status =
-      update->Finalize(Error{ErrorKind::kCommitFailed, "simulated failure"});
+  auto finalize_status = update->Finalize(
+      Error{.kind = ErrorKind::kCommitFailed, .message = "simulated failure"});
   EXPECT_THAT(finalize_status, IsOk());
   EXPECT_TRUE(deleted_files.empty());
 }