Make JobseekerApplicationsReport specs DRYer.

Reduce duplication in the specs for JobseekerApplicationsReport, taking setup code out of the tests and thereby making their purpose clearer.
Make JobReport specs DRYer.

Reduce duplication in the specs for JobReport, taking setup code out of the tests and thereby making their purpose clearer.
Make Jobseeker#apply_to specs DRYer.

Reduce duplication in the specs for Jobseeker#apply_to, taking setup code out of the tests and thereby making their purpose clearer.