add ab-testing.md

Javier Garciarequested to merge
jg-add-optimizely-notes into main

1. Change Summary

[Describe what is changing, why, and the impact]

  • Used GitLab Duo to generate docs for Optimizely
    • I edited down the generated content to what I thought was most relevant
    • I also included some gotchas from our Slack channel to hopefully prevent repeated errors in the future

Edited by Javier Garcia

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