Remove product analytics from left nav

Kati Paizeerequested to merge
kpaizee-main-patch-99428 into main

The Product Analytics page was removed in this MR: gitlab!101500 (merged)

Removing from the left nav as it's currently breaking our pipeline: https://gitlab.com/gitlab-org/gitlab-docs/-/jobs/3224925932

Edited by Kati Paizee

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