[SPARK-34153][SQL][2.4] Remove unused getRawTable() from `HiveExter…

…nalCatalog.alterPartitions()`

### What changes were proposed in this pull request?
Remove unused call of `getRawTable()` from `HiveExternalCatalog.alterPartitions()`.

### Why are the changes needed?
It reduces the number of calls to Hive External catalog.

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

### How was this patch tested?
By existing test suites.

Authored-by: Max Gekk <max.gekkgmail.com>
Signed-off-by: HyukjinKwon <gurwls223apache.org>
(cherry picked from commit bea10a6)
Signed-off-by: Max Gekk <max.gekkgmail.com>

Closes #31242 from MaxGekk/remove-getRawTable-from-alterPartitions-2.4.

Authored-by: Max Gekk <max.gekk@gmail.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala

@@ -1102,9 +1102,6 @@ private[spark] class HiveExternalCatalog(conf: SparkConf, hadoopConf: Configurat
       table: String,
       newParts: Seq[CatalogTablePartition]): Unit = withClient {
     val lowerCasedParts = newParts.map(p => p.copy(spec = lowerCasePartitionSpec(p.spec)))
-
-    val rawTable = getRawTable(db, table)
-
     // convert partition statistics to properties so that we can persist them through hive api
     val withStatsProps = lowerCasedParts.map { p =>
       if (p.stats.isDefined) {