gokrazy/build: expose AMI pipeline as composable steps

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Make CheckAWSAuth, UploadToS3, ImportSnapshot, and RegisterAMI public so
a build server can run them individually (e.g. Marketplace publishing
after RegisterAMI). Rename BuildAMI to BuildAndImportAMI, now a thin
orchestrator over them. Each step records into Result and returns its
artifact; the AWS steps guard on their predecessor and error clearly if
called out of order.

Updates #1866

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

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