Ensure that selected exploration parameter is present in the model

[lrebscher]

We can get to an invalid state when a user changes a model after configuring the Experiment.

Or when a user loads the model specification of an older model that has a different set of parameters than the one currently loaded.

[ddelpiano]

discuss to Salva, we should freeze the model used to create the experiment, if the user continue to edit the model it won't reflect on the experiment(s) already created.

[ddelpiano]

if the exploration parameter(s) are not present(s) anymore in the current model and the user try to simulate we stop the simulation flow, we use a modal/dialog to warn about the issue and ask the user to review the experiment configuration.