Draft: Cloud Seed FY24 roadmap

Why is this change being made?

Document the FY24 roadmap in the handbook. Complimentary slide deck: https://docs.google.com/presentation/d/12aPUbCDppA2KkroHQfPQXsKADDR57vnr0cbMxkD9Ox0/edit#slide=id.g1287bf62b57_0_209

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
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  • 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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