pes_events_scanner: fix processing of RpmTransactionTasks #1296
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RpmTransactionTasks messages have higher priority than instructions based on PES data. Previously, if multiple such messages existed with duplicate instructions, this could lead to the crash of the actor - especially in case when an existing package has been asked to be removed several times. Ensure the occurance of each instruction is unique (list -> set).
jira: RHEL-50076
Note: just written on knees without testing. Unit tests should be updated too.