Validate results after SingleTestRun/EnsembleExperiment

Sometimes it is a bit hard for users to tell if all the required observations and parameters are loaded in the callback. In AHM we allow some observations to be missing, and only crash if all observations are deactivated.

The REFCASE has some functionality to check that the correct dates are present for summary data, however there has historically been a problem that it is not necessarily in sync with the schedule file, and as such, might give false positives or negatives.

One way we can improve this, is by validating that SingleTestRun and EnsembleExperiment validate the results for missing parameters and responses. This can be as simple as raising an exception when it has completed if something is missing, and everything should show up correctly in the gui.

Start by tracing the SingleTestRun and EnsembleExperiment completion paths and compare their result handling with the existing REFCASE date checks. Determine how missing parameters and responses are represented, including partially missing observations allowed by AHM. Done means missing required results raise an exception after completion and the results display correctly in the GUI.