[KYUUBI #5576][Bug] Fix wrong code in test case of dir command

### _Why are the changes needed?_
To close #5575
 Fix wrong code in test case of dir command

### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.readthedocs.io/en/master/contributing/code/testing.html#running-tests) locally before make a pull request

### _Was this patch authored or co-authored using generative AI tooling?_
No

Closes #5577 from AngersZhuuuu/KYUUBI-5576.

Closes #5576

60e2cb8 [Angerszhuuuu] [KYUUBI #5576][Bug] Fix wrong code in test case of dir command

Authored-by: Angerszhuuuu <[email protected]>
Signed-off-by: Cheng Pan <[email protected]>

extensions/spark/kyuubi-spark-authz/src/test/scala/org/apache/kyuubi/plugin/spark/authz/PrivilegesBuilderSuite.scala

@@ -1450,7 +1450,7 @@ class HiveCatalogPrivilegeBuilderSuite extends PrivilegesBuilderSuite {
     val directory = File(tableDirectory).createDirectory()
     val plan = sql(
       s"""
-         |INSERT OVERWRITE DIRECTORY '$directory.path'
+         |INSERT OVERWRITE DIRECTORY '${directory.path}'
          |USING parquet
          |SELECT * FROM $reusedPartTable""".stripMargin)
       .queryExecution.analyzed
@@ -1574,7 +1574,7 @@ class HiveCatalogPrivilegeBuilderSuite extends PrivilegesBuilderSuite {
     val directory = File(tableDirectory).createDirectory()
     val plan = sql(
       s"""
-         |INSERT OVERWRITE DIRECTORY '$directory.path'
+         |INSERT OVERWRITE DIRECTORY '${directory.path}'
          |USING parquet
          |SELECT * FROM $reusedPartTable""".stripMargin)
       .queryExecution.analyzed
@@ -1599,7 +1599,7 @@ class HiveCatalogPrivilegeBuilderSuite extends PrivilegesBuilderSuite {
     val directory = File(tableDirectory).createDirectory()
     val plan = sql(
       s"""
-         |INSERT OVERWRITE DIRECTORY '$directory.path'
+         |INSERT OVERWRITE DIRECTORY '${directory.path}'
          |ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
          |SELECT * FROM $reusedPartTable""".stripMargin)
       .queryExecution.analyzed