Move NPS-CSAT Scores Handbook from CSM to DCS ownership

Why is this change being made?

Currently, the NPS/CSAT Surveys handbook page is nested within Customer Success. It was originally written with the intention that CSMs were its primary readers. However, the scope of our NPS and CSAT surveys has changed considerably over time. Scale and Tech Touch customers receive these surveys, and there is additional guidance on how to review NPS/CSAT survey results for GitLab team members that don't have access to Gainsight directly.

Moving this page would more accurately reflect the purview of ownership.

Author Checklist

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added, and the content is SAFE
• Assign reviewers for this MR to the correct Directly Responsible Individual/s (DRI)
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the Maintained by section on the page being edited
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies
  • The when to get approval handbook section explains the workflow in more detail
• If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR
  • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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