Space DO bindings in wrangler but not exported

[arsdehnel]

On August 29th when this PR was merged the create-pds templated wrangler.jsonc got two new Space-related DOs. However, they were not added to the export from index.ts so deploys fail:

✘ [ERROR] A request to the Cloudflare API (/accounts/<account-id>/workers/scripts/<worker-name>) failed.

  Cannot apply new-class migration to class 'SpaceDurableObject' that is not exported by script.
  [code: 10070]

Easy enough to fix the exports in here but wondered about a couple other things:

1. Should the DOs be toggleable while the Spaces stuff is in Alpha? And if so then the template needs to be a little smarter.
2. Should there be some way to test that the newly-created worker can be deployed? Not sure about a deploy dry run or anything that could be wired up in a GitHub Action.

[arsdehnel]

Realizing now that I didn't make it clear in my original comment that my questions were to ask for guidance but I'd be happy to take on the change to address this. Just didn't want to dive into it without those answers.