Import EModel thumbnails

[g-bar]

We're missing the Emodel thumbnails in the Emodel list.

The original source of the thumbnail is the image field in EModel and we filter for the one with "about": "https://bbp.epfl.ch/data/bbp/mmb-point-neuron-framework-model/thumbnail"

AFAIK we do not import the original thumbnail because that wasn't pointing to a nexus entity, but just a raw file, (IIRC the dump just included distributions pointing to an entity).

From @AurelienJaquier

It is a plot of a run of the e-model with a supra-threshold current.
When we have an e-model configuration, we plot for the supra-threshold current with the lowest amplitude from the protocols from the configuration. For the e-models where we didn't have the configuration, we did the thumbnail plotting with a current equal to 130% of threshold if I recall correctly

Maybe we can puth that logic in thumbnail-generation-api and generate it on the fly?

[darshanmandge]

In addition, the thumbnails for me-models are using EModel thumbnail entries. This is incorrect. The thumbnail should be generated for the new morphology + emodel combination after simulating for 130% of threshold current.

Suggested solution: The thumbnail for memodel can be generated with a function which we can code in bluecellulab, and the thumbnail-generation-api can call it.