Impact Based Diagnostics

To make the model evaluations useful for users we should consider a range of impact-based diagnostics for factors that are important to users/customers. This is the super-ticket which monitors the progress.

For anyone contributing to diagnostics for these issues please ensure that @daflack is included as a reviewer.

All impact-based diagnostics should be added to the relevant section in the `Derived Diagnostics` section of CSET (indicated in their respective issues). Furthermore, in the descriptor for the GUI please ensure to start with `IMPACT-BASED DIAGNOSTIC` to make it clear to users that this is an impact-based diagnostic.

Please feel free to add further impact-based diagnostics to this issue as sub-issues.

Start by reviewing the proposed sub-issues and the `Derived Diagnostics` section of CSET. Each diagnostic should address an identified user or customer impact, appear in the relevant section, and have a GUI descriptor beginning with `IMPACT-BASED DIAGNOSTIC`; include @daflack as a reviewer.

Written by the indexing model from the issue text.