Remove Payload from server-external-packages.json (#62965)
Payload is moving to ESM, and we need to be removed from the default
list of `serverComponentsExternalPackages`.
This PR simply removes Payload from the default list. Developers can add
it back in if they are using older versions of Payload.
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Co-authored-by: JJ Kasper <jj@jjsweb.site>
