Don't use endianness reverse util for writing KeyStore file #78304
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When Elasticsearch was upgraded to Lucene 9.0, the keystore mechanism for files was not changed and we are just reversing the endianness of the files for reading and writing. On the long term we want to write the file in the endianness of the data input so this PR does that. New files are writing in LE and a new version of the files is added. We handle the different endianness when reading files.
follow up of #73324