Adds SME review to SSCs

Why is this change being made?

@mharris3 and @llandon surfaced a need for subject-matter expert review of enablement campaigns put together by the CS Programs team. While the overall burden of this responsibility should be low, having SSCs be the "go to" person for requests for review provides value for GitLab and GitLab Support. Ensuring that our customers are equipped with technically accurate information will reduce support burden when these campaings are sent out to customers.

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