[OPT-6007] Allow process reports to be viewed as %, grouped by none, distributed by process - camunda JIRA

We should support process instance reports viewed as a %, grouped by none, distributed by process (for multiprocess reports)

ATs:

Process instance reports can be view as percentage/grouped by none/distributed by process
When an instance or flow node date filter is applied to such a report, the total count is also reduced to reflect this
Other filters should not affect the baseline counts

We should support process instance reports viewed as a %, grouped by none, distributed by process (for multiprocess reports)

ATs:

Process instance reports can be view as percentage/grouped by none/distributed by process
When an instance or flow node date filter is applied to such a report, the total count is also reduced to reflect this
Other filters should not affect the baseline counts