Clone a worker configuration

Refs https://gitlab.com/teklia/requests/-/issues/780

A user should be able to clone an existing configuration to build a new one.

A new "Clone" button should be available on the worker configuration edition component, immediately redirecting the user towards a new version of that same configuration (with a name "Copy of X" where "X" is the original name of the configuration).

The user must then make a change to the configuration before saving it.