Revert "Foundational agents going GA"

Nate Rosandichrequested to merge
duo-edit-20251211-194446 into master

This reverts merge request !215137 (merged).

Reverts the changes that marked foundational agents as generally available in GitLab 18.7.

gitlab-com/www-gitlab-com!142044 (comment 2949116942)

Edited by Nate Rosandich

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