Relax uniqueness constraint of Repository URLs inside a Product and add optional name field for repositories

[mmurto]

I'd like to be able to add multiple instances of same repository URL inside of a Product to organize analysis pipelines better. The URL is however currently enforced to be unique inside a Product. I'd like this constraint to be removed.

As having multiple Repositories with same URL inside one Product makes distinguishing them impossible, it would be great to be able to define a name field for each Repository, that would be shown in the Repository list and the breadcrumb. This would help distinguishing between multiple repositories also without duplicate URLs inside a Product, as it's likely that the repositoriy URLs of a Product share a lot of elements ("https://provider.com/organization").

I'd prefer the name field to be optional to keep the UX straight-forward in cases on single Repository Products, and in those cases display the URL instead of name.