Reduce repetitive Z on job log timestamps
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### Release notes
Added informational text that job log timestamps are shown in UTC.
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### Problem to solve
The Z is repetitive on each line in the job log and can be consolidated elsewhere in the log view.
<!--What is the user problem you are trying to solve with this issue?-->
### Proposal
* Add the following text to the job log header - `Timestamps in UTC.`
* [See designs in design management](https://gitlab.com/gitlab-org/gitlab/-/issues/476166/designs/toolbar-update.png)
* [Figma file](https://www.figma.com/design/4Pr5dZdVHrN0GlnqoxBkHu/Runner-Core?node-id=131-7121&t=mXSpO0hSpJaF6LF0-1)
#### Implementation guide
1. In [`ci/job_details/components/job_log_top_bar.vue`](https://gitlab.com/gitlab-org/gitlab/-/blob/dff3b83a80b004fcac7165047d0e15383eebc2cf/app/assets/javascripts/ci/job_details/components/job_log_top_bar.vue):
- add the message to the top bar:
- split the `<div class="gl-hidden sm:gl-block gl-text-truncate" data-testid="showing-last">` into a `<div class="gl-hidden sm:gl-block gl-text-truncate">` and a `<span data-testid="showing-last">` inside of it
- move the `<!-- truncated log information -->` comments so that they wrap the `<span>`
- add `{{ s__('Job|Timestamps in UTC.') }}` inside the `<div>` after the `<span>`
- remove the Z from [the string in the `extractTime` util](https://gitlab.com/gitlab-org/gitlab/-/blob/dff3b83a80b004fcac7165047d0e15383eebc2cf/app/assets/javascripts/ci/job_details/store/utils.js#L30) and any Zs in the explanatory comment above it
2. Run `tooling/bin/gettext_extractor locale/gitlab.pot` to [update PO files](https://docs.gitlab.com/ee/development/i18n/externalization.html#updating-the-po-files-with-the-new-content)
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### Intended users
Software developers
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