triage-ops: Rebranding `Chief of Staff Team to the CEO`

What does this MR do and why?

Describe in detail what your merge request does and why.

The Chief of Staff Team to the CEO has been rebranded to Office of the CEO in gitlab-com/content-sites/handbook!4279 (merged). As such, updating the handbook paths.

Related to: Rename: Office of the CEO (gitlab-com/office-of-the-ceo/office-of-the-ceo-team#357 - closed)
Related to: handbook: Rebranding `Chief of Staff Team to th... (gitlab-com/content-sites/handbook!4826 - merged)
Related to: https://gitlab.com/gitlab-com/content-sites/internal-handbook/-/merge_requests/4455+
Related to: triage-ops: Rebranding `Chief of Staff Team to ... (!2741 - merged)
Related to: www-gitlab-com: Rebranding `Chief of Staff Team... (gitlab-com/www-gitlab-com!133815 - merged)

Expected impact & dry-runs

These are strongly recommended to assist reviewers and reduce the time to merge your change.

See https://gitlab.com/gitlab-org/quality/triage-ops/-/tree/master/doc/scheduled#testing-policies-with-a-dry-run on how to perform dry-runs for new policies.

See https://gitlab.com/gitlab-org/quality/triage-ops/-/blob/master/doc/reactive/best_practices.md#use-the-sandbox-to-test-new-processors on how to make sure a new processor can be tested.

Action items

• If adding environment variables for reactive processors, update config/triage-web.yaml and .gitlab/ci/triage-web.yml
• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review