Revert "PS-9378: Backport PS-9302 (WRITESET perf improvements) to 8.0"

This reverts commit 40d7e5a.

Author: percona-ysorokin

sql/rpl_trx_tracking.h

@@ -27,7 +27,7 @@
 #include <assert.h>
 #include <sys/types.h>
 #include <atomic>
-#include <unordered_map>
+#include <map>
 
 #include "libbinlogevents/include/binlog_event.h"
 
@@ -163,7 +163,7 @@ class Writeset_trx_dependency_tracker {
     Track the last transaction sequence number that changed each row
     in the database, using row hashes from the writeset as the index.
   */
-  typedef std::unordered_map<uint64, int64> Writeset_history;
+  typedef std::map<uint64, int64> Writeset_history;
   std::shared_ptr<Writeset_history> m_writeset_history;
 };