Fix bug where child activity types are not visible in plan UI when parent is placed with scheduling

This issue has come up while testing Europa Clipper scheduling goals (on clipper-aerie main) on a local aerie deployment. I have noticed that when running the scheduler for goals that have multiple activity types, the children of the parent types do not show up in the plan window after successful scheduling + simulation. However, the children do show up in the "Simulated Activities Table". I have manually placed the individual parents in the plan and simulated and the children do show up in that case.

Attached below is a screenshot of a goal SUDA_Solar_Noise_Cal after scheduling and simulation. You are able to see the parents in the UI, but the children of GNC_Single_Turn, SUDA_All_Characterization, and GNC_Roll do not show up. But they are shown in the table below the plan view with expected start times and durations.

This bug can be reproduced by writing a scheduling goal that places a set of varied activity types (that have children) and running the scheduler, simulating, and assessing the UI view and simulated activities table.

Workaround

Use table view

Reproduce the issue with a scheduling goal containing varied activity types with children, then run scheduling and simulation. Compare the plan window with the Simulated Activities Table: done means child activities appear in the plan UI as they already do in the table, without relying on the table-view workaround.