jenkins.rs: Add `Job::new` function to create Job from JSON payload

Now we can parse the JSON payload in a single place and extract the
values from it into a new `Job`.

Change `Job.result`'s type to `JobStatus` because that makes more sense.
Now, `result_from_job` gets called in `Job::new` to give us the
`JobStatus` directly on the `Job`.

Modify `result_from_job` to fit into its new responsibility, working for
`Job::new`. Update the tests accordingly.

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