feat: add param to use fqn in updater

[outrider-jhulas]

As mentioned in #318, it's a possible solution to the fully qualified name not being included anywhere in the diagnostic message, making it impossible to properly aggregate.

This PR adds a parameter use_fqn to set a bool. It will then use fully qualified name in the name field in the diagnostic updater

[ct2034]

Thanks for your contribution @outrider-jhulas 😀
Could you please add a test that verifies what names are used with and without your parameter.