Swimlanes - Load more epics button and hide unassigned issues
As part of improving Swimlanes performance, we want to change the way we fetch epics:
- Add
Load more epicsbutton and stop chaining the fetching of all epics - Reduce the epics page size to 10
- Go back to fetching issues per epic instead of fetching issues under epics per list
- Collapse Unassigned issues lane by default and only fetch those issues on expand