Improve product analytics project onboarding docs
What does this MR do and why?
Expands on the product analytics docs.
Add section for onboarding a project with product analytics.
Screenshots or screen recordings
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How to set up and validate locally
http://gdk.test:3005/ee/user/product_analytics/#onboard-a-gitlab-project
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #430777 (closed)
Edited by Elwyn Benson