C#, Scala, and DAML code generators do not handle duplicate typename in different namespaces properly and fails

[PayalKhanna]

Description

when we have two types with same name in a different namespaces its fails for these 3 code generators with errors similar to below
The namespace '***' already contains a definition for 'SubstitutionProvisions'

The namespace '*' already contains a definition for 'SubstitutionProvisionsMeta'
The namespace ' ' already contains a definition for 'SubstitutionProvisionsValidator'

Is this a regression?

no

Expected behaviour

the Code Generators should handle both the types in different namespaces properly