[Corrective Action] Add integration/feature spec to check a retried build has the same attributes from the previous build

Problem

Originally this problem was unveiled in this comment. This issue is a corrective action for a recent production incident on CI/CD pipelines.

Proposal

Yes. Maybe we can also test this as a feature spec as well--at least to confirm the Ci::Build attributes are correct (e.g. build.tag == retried_build.tag, build.tag == build.pipeline.tag)..

gitlab-com/gl-infra/production#5498 (comment 671866315)