Add Duo Enterprise trial info to docs
What does this MR do and why?
On 2024-10-17, free access to Duo Enterprise features will end, and we will introduce availability of a GitLab Duo Enterprise 60-day, 100-user trial. This MR adds info on how to self-serve start a Duo Enterprise trial for Ultimate customers.
Related to https://gitlab.com/gitlab-org/gitlab/-/issues/482074.
MR acceptance checklist
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
Edited by Courtney Meddaugh