Skip orchestrated tests in the Praefect jobs

The Praefect jobs are intended to run all the unorchestated tests against an instance using Praefect for storage. So although it is technically an orchestrated scenario, it's orchestration that allows the regular tests to run, but not those tests that need additional orchestration provided by other scenarios.

One of those tests is move_project_create_fork_spec.rb, which is intended to be run in the RepositoryStorage scenario that configures additional storage. So the test fails in the Praefect scenario because Praefect is configured as the default storage, not additional.

This also removes the parallel param from the quarantine jobs, because there's typically not enough of them to need to run in multiple jobs.