Reduce repetitive Z on job log timestamps

Release notes

Added informational text that job log timestamps are shown in UTC.

Problem to solve

The Z is repetitive on each line in the job log and can be consolidated elsewhere in the log view.

Proposal

• Add the following text to the job log header - Timestamps in UTC.
• See designs in design management
• Figma file

Implementation guide

1. In 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 and any Zs in the explanatory comment above it
2. Run tooling/bin/gettext_extractor locale/gitlab.pot to update PO files

Intended users

Software developers

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