Refactor jest pipelines table spec in the commit page
Description
In #215883 (closed) we cleaned up spec/frontend/pipelines/pipelines_spec.js
.
However spec/frontend/commit/pipelines/pipelines_spec.js
still uses outdated way to test the same table in the commit component.
- https://gitlab.com/gitlab-org/gitlab/blob/master/spec/frontend/commit/pipelines/pipelines_spec.js#L1
We should clean up the specs.