Instead of keeping a slice of jobs to run, let the runJobs function
determine which jobs should be run by investigating all dependencies.
This has two benefits:
- The code is somewhat cleaner, as no 'jobs' slice needs to be
maintained while constructing the dependency graph.
- Eventually, some jobs might not be required by any dependency.
While it's possible to avoid adding them to the slice, the simpler
solution is to build a new slice from the dependencies which will
only include required dependencies by design.
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