fix(manager upgrade): check all of the details of the tasks
fix(manager upgrade): check all of the details of the tasks

As part of the manager upgrade test, we check that the details of 2 tasks
that were created before the upgrade remained the same afterwards.
Previously the check (validate_previous_task_details) reported on the first detail
that was mismatched and raised an error, before checking the rest.
I altered the function so that all of the details will be compared and reported.

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests