[SPARK-43279][CORE] Cleanup unused members from SparkHadoopUtil
#40942
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What changes were proposed in this pull request?
This pr clean up the following unused members from
SparkHadoopUtil:listLeafDirStatuses: introduced by SPARK-3928 and no longer used after SPARK-7673listFilesSorted: introduced by SPARK-5342 and no longer used after SPARK-23361getSuffixForCredentialsPath: same aslistFilesSortedSPARK_YARN_CREDS_TEMP_EXTENSION: same aslistFilesSortedSPARK_YARN_CREDS_COUNTER_DELIM: same aslistFilesSortedWhy are the changes needed?
Code cleanup
Does this PR introduce any user-facing change?
No, all cleaned up are internal APIs
How was this patch tested?
Pass GitHub Action