[MINOR] test(spark-connector): remove metastored_db and derby.log aft…

…er integration test (#3714)

### What changes were proposed in this pull request?
remove metastored_db and derby.log after integration test

### Why are the changes needed?
remove metastored_db and derby.log after integration test


### Does this PR introduce _any_ user-facing change?
no

### How was this patch tested?
existing tests

.gitignore

@@ -49,5 +49,6 @@ include clients/client-python/.gitignore
 .node
 
 # integration test
-integration-test/metastore_db
-catalogs/catalog-lakehouse-iceberg/spark-warehouse
+**/metastore_db
+**/spark-warehouse
+derby.log

spark-connector/v3.3/spark/build.gradle.kts

@@ -135,5 +135,7 @@ tasks.test {
 }
 
 tasks.clean {
+  delete("derby.log")
+  delete("metastore_db")
   delete("spark-warehouse")
 }

spark-connector/v3.4/spark/build.gradle.kts

@@ -136,5 +136,7 @@ tasks.test {
 }
 
 tasks.clean {
+  delete("derby.log")
+  delete("metastore_db")
   delete("spark-warehouse")
 }

spark-connector/v3.5/spark/build.gradle.kts

@@ -137,5 +137,7 @@ tasks.test {
 }
 
 tasks.clean {
+  delete("derby.log")
+  delete("metastore_db")
   delete("spark-warehouse")
 }