task: #3623277 Use alpha releases of the Webship packages

Rajab Natshahrequested to merge
issue/webship_starter-3623277:3623277-alpha-releases into 1.0.x

Closes #3623277

Requires ~12.0@alpha and ^1.0@alpha for the Webship packages instead of their dev branches, so 1.0.0-alpha1 can be tagged. drupal/webshare stays on 2.0.x-dev.

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