Rename `previousStageJobsAndNeeds` to `previousStageJobsOrNeeds` and update return

In order to correctly show the execution order of jobs, we should update previousStageJobsAndNeeds with some requirements that we need.

• Rename field to previousStageJobsOrNeeds to better describe what we are returning
• Return previousStageJobsOrNeeds: [someNeed] if there are explicit needs needs: [someNeed] - so ONLY the explicit needs.
• Return empty previousStageJobsOrNeeds: [] if there are needs stated with an empty array needs: []
• Return the jobs from previous stages for a build that has NO needs previousStageJobsOrNeeds: [prevstagejob1, prevstagejob2]