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memtx: abort readers of rollbacked prepared

There's case when a transaction is rolled back from prepared
state. This happens when WAL fails, synchronized replication
confirmation failure or perhaps in other similar cases. By design
other RW transactions and transactions with READ_COMMITTED
isolation level are allowed to read prepared state. All these
transactions must be aborted in case of rollback of prepared
transaction since they definitely have read no more possible
database state.

This patch implements this abortion.

Closed #8654

NO_DOC=bugfix

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