When run after ee/spec/features/dashboards/activity_spec.rb, this would
fail to find the correct constant with:

> NameError: uninitialized constant Events::RepositoryUpdatedEvent

I'm not sure why this was; we give `Object.const_get` a fully-qualified
constant, and it should look that up first before attempting the default
behaviour of finding constants in ancestor classes.

Alternatives:

- `Object.const_get("::#{current_namespace}...")` - didn't work.
- `"::#{current_namespace}...".constantize` - does work, but that is a
  bigger change as `#constantize` does much more work here.