Change type of CiJob.needs [RUN AS-IF-FOSS]

What does this MR do?

This fixes a ~bug in our GraphQL schema where CiJob.needs has the incorrect type JobType.connection_type.

The return value of Build#needs is not a relation of builds, but a relation of Ci::BuildNeed, which shares the attribute name, but no other valid values.

Fixes: #294058 (closed) Addresses: https://gitlab.com/gitlab-org/gitlab/-/issues/294217

Note that this is not a breaking change because the following query will continue to work:

query {
  project(fullPath: "gitlab-org/gitlab") {
    mergeRequest(iid: "123") {
      headPipeline {
        jobs {
          nodes {
            needs {
              nodes {
                name
              }
            }
          }
        }
      }
    }
  }
}

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team