Improve label for time value on jobs index page
## 🧩 Problem
The `Timing` label on the job index page ([example](https://gitlab.com/gitlab-org/gitlab/-/jobs)) is inconsistent with `Duration` label on the pipeline index page ([example](https://gitlab.com/gitlab-org/gitlab/-/pipelines))
## 📑 Background
</details>
<details><summary> On the job index page</summary>
| Job Index Page |
|----|
|  |
</details>
## Proposal
Change the `Timing` label to be consistent with label on pipeline index page.
issue