Test case for JBPM-9619 - Task inbox fails to display data due to inefficient jbpmHumanTasksWithUser query

Adding additional test case to cover RHPAM-3467.

We need to make sure query limit is added to the query when post processing enable flag is set to false along with no further in-memory post processing is done.

Besides, as regression, current behavior should be checked, i.e. when post processing flag is set to true, no limit is explicitly added in the query and the post processing is done.