[SPARK-51219][SQL][TESTS][FOLLOWUP] ShowTablesExec remove ArrayImplicits`

### What changes were proposed in this pull request?

Related to #49144. scala 2.12 is failing with `ArrayImplicits`, which is in use for `ShowTablesExec.isTempView` method. This PR removes `org.apache.spark.util.ArrayImplicits._` from `ShowTablesExec` and uses default Seq instead.

### Why are the changes needed?

To fix failing scala 2.12 compilation isssu.

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

Existing init tests and actions run.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #50008 from ostronaut/features/ShowTablesExec-remove-ArrayImplicits.

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

Author: ostronaut

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

@@ -25,7 +25,6 @@ import org.apache.spark.sql.catalyst.util.StringUtils
 import org.apache.spark.sql.connector.catalog.{CatalogV2Util, Identifier, TableCatalog}
 import org.apache.spark.sql.connector.catalog.CatalogV2Implicits.NamespaceHelper
 import org.apache.spark.sql.execution.LeafExecNode
-import org.apache.spark.util.ArrayImplicits._
 
 /**
  * Physical plan node for showing tables.
@@ -50,8 +49,7 @@ case class ShowTablesExec(
 
   private def isTempView(ident: Identifier, catalog: TableCatalog): Boolean = {
     if (CatalogV2Util.isSessionCatalog(catalog)) {
-      session.sessionState.catalog
-        .isTempView((ident.namespace() :+ ident.name()).toImmutableArraySeq)
+      session.sessionState.catalog.isTempView(ident.namespace() :+ ident.name())
     } else false
   }
 }