[JIRAALIGN-1471] Features: User can add Additional Programs in Features that have Approach disabled

Issue Summary

If a Feature has the Approach set as Multi-Program, it is going to allow users to keep editing the Additional Programs, even if the Approach gets disabled.
As the Additional Programs fields don't get hidden, users will be able to keep editing the field as if the Approach was still enabled.

Steps to Reproduce

1. Enable Approach
2. Create/update Feature
3. Select Approach = Multi-Program Feature
4. Disable Approach
5. Feature Still shows Additional Programs with the previously selected program or blank field if none was selected before. Updates are still allowed.

Expected Results

To be defined by the PDM team. The users expect that once Approach is disabled, all previous input will be ignored (although we can still keep the data in the DB for history purpose)

Actual Results

Once Approach is disabled, we still allow updates to Additional Programs fields

Workaround

The immediate workaround for this issue would be re-enable Approach and update the Features presenting this issue by setting the Approach field with "Single Program Feature" or leaving the field blank.