clean datafusion_iceberg after test

Author: JanKaul

Makefile

@@ -7,7 +7,7 @@ test-iceberg-rust:
 	cargo test -p iceberg-rust --lib
 
 test-datafusion_iceberg:
-	cargo test -p datafusion_iceberg --tests -j 2
+	cargo test -p datafusion_iceberg --tests -j 2 && cargo clean -p datafusion_iceberg
 
 test-rest-catalog:
 	cargo test -p iceberg-rest-catalog --lib && cargo clean -p iceberg-rest-catalog