[SPARK-33569][SPARK-33452][SQL][FOLLOWUP] Fix a build error in ShowPartitionsExec

### What changes were proposed in this pull request?
Use `listPartitionIdentifiers ` instead of `listPartitionByNames` in `ShowPartitionsExec`. The `listPartitionByNames` was renamed by #30514.

### Why are the changes needed?
To fix build error.

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

### How was this patch tested?
By running tests for the `SHOW PARTITIONS` command:
```
$ build/sbt -Phive-2.3 -Phive-thriftserver "test:testOnly *ShowPartitionsSuite"
```

Closes #30553 from MaxGekk/fix-build-show-partitions-exec.

Authored-by: Max Gekk <[email protected]>
Signed-off-by: Wenchen Fan <[email protected]>

Author: MaxGekk

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/ShowPartitionsExec.scala

@@ -41,7 +41,7 @@ case class ShowPartitionsExec(
       // listPartitionByNames() should return all partitions if the partition spec
       // does not specify any partition names.
       .getOrElse((Seq.empty[String], InternalRow.empty))
-    val partitionIdentifiers = table.listPartitionByNames(names.toArray, ident)
+    val partitionIdentifiers = table.listPartitionIdentifiers(names.toArray, ident)
     // Converting partition identifiers as `InternalRow` of partition values,
     // for instance InternalRow(value0, value1, ..., valueN), to `InternalRow`s
     // with a string in the format: "col0=value0/col1=value1/.../colN=valueN".