Adds previousStageJobAndNeeds field to JobType

What does this MR do and why?

Query:

{
  project(fullPath: "root/possession") {
    pipeline(iid: "9") {
      jobs {
        nodes {
          name
          needs {
            nodes {
              name
            }
          }
          needsAndPreviousStageJobs {
            nodes{
              name
            }
          }
        }
      }
    }
  }
}

Response:

{
  "data": {
    "project": {
      "pipeline": {
        "jobs": {
          "nodes": [
            {
              "name": "deploy-job",
              "needs": {
                "nodes": [
                  {
                    "name": "lint-test-job"
                  }
                ]
              },
              "previousStageJobsAndNeeds": {
                "nodes": [
                  {
                    "name": "unit-test-job"
                  },
                  {
                    "name": "lint-test-job"
                  }
                ]
              }
            },
            {
              "name": "lint-test-job",
              "needs": {
                "nodes": []
              },
              "previousStageJobsAndNeeds": {
                "nodes": [
                  {
                    "name": "build-job"
                  }
                ]
              }
            },
            {
              "name": "unit-test-job",
              "needs": {
                "nodes": [
                  {
                    "name": "build-job"
                  }
                ]
              },
              "previousStageJobsAndNeeds": {
                "nodes": [
                  {
                    "name": "build-job"
                  }
                ]
              }
            },
            {
              "name": "build-job",
              "needs": {
                "nodes": []
              },
              "previousStageJobsAndNeeds": {
                "nodes": []
              }
            }
          ]
        }
      }
    }
  }
}

gitlab-ci.yml

stages: 
  - build
  - test
  - deploy

build-job:
  stage: build
  script:
    - echo "Compiling the code..."
    - echo "Compile complete."

unit-test-job:
  stage: test
  script:
    - echo "Running unit tests... This will take about 60 seconds."
    - sleep 60
    - echo "Code coverage is 90%"
  needs:
    - build-job

lint-test-job:
  stage: test
  script:
    - echo "Linting code... This will take about 10 seconds."
    - sleep 10
    - echo "No lint issues found."

deploy-job:
  stage: deploy
  script:
    - echo "Deploying application..."
    - echo "Application successfully deployed."
  needs:
    - lint-test-job

MR acceptance checklist

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