Rename `build_events` to `job_events`

What does this MR do?

This MR renames build_events to job_events everywhere. That way there is no more confusion on what param to use. Its job_events.

We will need to support older params in API V3 thought.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

The build_events attribute was accidentally ignored in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10586 causing https://gitlab.com/gitlab-org/gitlab-ce/issues/31620

@zj already suggested this solution, but the tools for zero downtime migrations weren't in place yet.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #31620 (closed)