Docs: Fix using deprecated global declarations in example .gitlab-ci.ymls

What does this MR do?

Fixes usage of deprecated global declarations in the example .gitlab-ci.yml files.

Author's checklist (required)

• Follow the Documentation Guidelines and Style Guide.

Review checklist

All reviewers can help ensure accuracy, clarity, completeness, and adherence to the Documentation Guidelines and Style Guide.

1. Primary Reviewer

• Review by a code reviewer or other selected colleague to confirm accuracy, clarity, and completeness. This can be skipped for minor fixes without substantive content changes.

2. Technical Writer

• Technical writer review. If not requested for this MR, must be scheduled post-merge. To request for this MR, assign the writer listed for the applicable DevOps stage.
  • Ensure docs metadata are present and up-to-date.
  • Ensure Technical Writing and documentation are added.
  • Add the corresponding docs:: scoped label.
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  • Add twfinished if Technical Writing team work on the MR is complete but it remains open.

3. Maintainer

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2. Ensure a release milestone is set.
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