Document contributors.gitlab.com gPAT

Lee Tickettrequested to merge
gitlab-community/gitlab-org/developer-relations/contributor-success/contributors-gitlab-com:document-gpat into main

What does this MR do and why?

Documents the use of a contributors.gitlab.com service account gPAT to reduce risk

Changelog: Maintenance

Screenshots or screen recordings

Before After

Validation steps

/cc @leetickett-gitlab

Closes #723

Edited by Lee Tickett

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