Changes at "Allow to filter assemblies by type"

Is your feature request related to a problem? Please describe.

Currently there only a simple filter in assemblies admin. We need to add filter by \"Assembly type\", taking into account values in the AssembliesTypes model.

Describe the solution you'd like

Create a filter in the admin that allows to filter by Assembly type

Describe alternatives you've considered

No alternatives considered

Additional context

Pull request: https://github.com/Platoniq/decidim-bcnencomu/pull/15

Funded by

Catalunya en Comú