Too long constraint name for the auto-generated enum constraints

[henrikdahl8240]

I have several cases, where the auto-generated name for an enum constraint is too long, i.e. > 128 characters. It is this feature I talk about: https://docs.microsoft.com/en-us/ef/core/what-is-new/ef-core-5.0/whatsnew#generation-of-check-constraints-for-enum-mappings

In case of foreign keys, the auto-generated constraint name may be overruled by invoking .HasConstraintName.

It seems like there currently is no .HasConstraintName for these enum related constraints. In my opinion, you need to add that, so these auto-generated names can also be overridden because otherwise these constraints will prevent usage of EF Core.

[AndriySvyryd]

Duplicate of #18958