Follow-up from "Remove Pendo from EE"

The following discussion from !19400 (merged) should be addressed:

• @dstull started a discussion:

  remove this once code has been deployed as per https://docs.gitlab.com/ee/development/what_requires_downtime.html#step-2-removing-the-ignore-rule

Do not start this until version >= 12.6 && date >= 12/1/2019