ci: proxy create-release-draft via repository_dispatch

[mberrys]

What changed

Cloud agents cannot workflow_dispatch CreateReleaseDraft. Extend Dispatch_Packaging with a create-release-draft repository_dispatch event that forwards to CreateReleaseDraft.yml using github.token.

Usage after merge

gh api repos/studio-berry/loop/dispatches \
  -f event_type=create-release-draft \
  -f 'client_payload[source_sha]=e6bf4117b891748b9b2b9f09e946f2369f16fc09' \
  -f 'client_payload[allow_existing_release]=false'

Proof

• Packaging qualification green on e6bf4117: Linux 34960116122, Windows 34960117789

  

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