Add editor extensions security considerations page
What does this MR do and why?
This change adds a new documentation page that explains security risks and safety practices when using GitLab's AI-powered editor extensions. The document warns users that these extensions run directly on their computer without protective barriers, which means they can access files, run commands, and potentially be exploited by malicious prompts. It recommends users carefully review any actions before allowing them to run, only use trusted add-ons, and ideally work inside isolated development containers for better security.
References
- Source issue: https://gitlab.com/gitlab-org/gitlab/-/issues/582999
- VS Code MR to update docs on how to use dev containers: !215340 (merged)
MR acceptance checklist
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