This fixes occurences of a loop variable being captured in parallel
tests. With the previous code, only the last test case is actually
exercised. To work around this problem, we create a local copy of the
range variable before the parallel test, as suggested in the
documentation for the `testing` package:
https://pkg.go.dev/testing#hdr-Subtests_and_Sub_benchmarks
Issues were found automatically using the `loopvarcapture` linter.
* Move the server daemons into their own package
With this change the internal/server package now is dedicated to the server domain (workers and controllers) and not to the server daemons.
The hope is that this will make it easier to keep the daemons decoupled from the representation of the servers in the database.