[Fix][Common] Problems with comma-separated logic in variable values during variable substitution.(#9151)

Author: qifanlili

Diff for: seatunnel-core/seatunnel-core-starter/src/test/java/org/apache/seatunnel/core/starter/utils/ParameterSplitterTest.java

@@ -21,6 +21,8 @@
 
 import org.junit.jupiter.api.Test;
 
+import java.util.List;
+
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class ParameterSplitterTest {