Objective Still linked to Program Even After Deletion

Issue Summary

This issue occurs in Solution Objectives because we allow programs to be deleted that are associated with a solution objective. 

Steps to Reproduce

1. In a Solution Objetive
2. Delete an associated Program

Expected Results

• We should have a check like this below when we delete a Program Objective.

• To support that, we cannot even associate a Solution Objective if the solution does not have an associated child program.

Actual Results

• Try to update the Objective and it fails, due to remaining link to Program.
• Deleted child programs of a Solution Objectives are still associated with the GET objectives API response.

Workaround

Remove the deleted program first from the affected solution objective using PATCH.