GetFriendlyTypeName with an array of a generic type breaks

## Description
When passing a e.g. `GenericClass[]` to Elsa.Extensions.TypeExtensions.GetFriendlyTypeName, it returns the FullName (e.g. ```Namespace.GenericClass`1[[System.String, System, Version=...]][]```) instead of a friendly name.

This for example breaks the C# evaluator in Elsa.Expressions.CSharp.Handlers.GenerateWorkflowVariableAccessors.HandleAsync when having an input of this type.