Serverless twin PR - adds CNVM requirement

[benironside]

Fixes #5304. Adds a requirement to the CNVM serverless docs. The language was already approved for the ESS version.

Previews:
Get started with CNVM
CNVM FAQ

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[mergify]

This pull request does not have a backport label. Could you fix it @benironside? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• v7.x is the label to automatically backport to the 7.x branch.
• v7./d./d is the label to automatically backport to the 7./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

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[joepeeples]

👍 👍