Add CustomersDot setup back to 3rd party LLM docs
What does this MR do and why?
After Duo Chat has gone GA, CustomersDot is required to test self-managed AI features locally.
This MR adds them back to the docs.
MR acceptance checklist
Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
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How to set up and validate locally
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Edited by Lesley Razzaghian