Explainability issue when a scheduling rule fails because of invisible simulation data

nsims
https://jira.jpl.nasa.gov/browse/AERIEQS-426
Moderate
Here is an example to illustrate the point:

If I wrote a scheduling rule to add an instance of activity type X (e.g. UVS_Power_On) an hour before the start of each instance of activity type Y (e.g. UVS_Power_Off), but NOT during times when activity Z (SUDA_Decontamination) is also occurring... The scheduler would be unable to add the activity, but wouldn't be able to tell me why â nor would that be immediately visible to me.

The reason it would be unable to add the activity is because SUDA_Decontamination has a duration (once simulated) that would extend beyond the window specified in my scheduling goal. Because the scheduler runs its own internal simulation, it would know not to place an activity there. But I would have to run my own simulation in the UI to gain access to that context.

EDIT(dailis): This may be alleviated if #723 gets through

Start with the example in this issue and the linked AERIEQS-426 ticket, then trace how the scheduler reports an activity that cannot be placed and how the UI presents that result. Done means the user can see when invisible simulated data caused the failure and understand the relevant scheduling context.