Check if a version upload will fail due to a DO migration

[nikitassharma]

Describe the solution

wrangler versions upload will fail if a change contains a durable object migration. Afaict, the only reliable way to check if a pending change contains a durable object migration is to run a versions upload and grep through the output, making scripting in CI difficult.

Since API calls are needed to validate this (wrangler/src/durable.ts#L64C5-L68C58) we can't update --dry-run to show pending DO migrations.

Instead, would it be possible to add a command such as wrangler versions check that validates if a worker version can be successfully uploaded?

✘ [ERROR] A request to the Cloudflare API (/accounts/2d755c260322537ff250be4cc2718320/workers/scripts/durable-object-migrations/versions) failed.

  Version upload failed. You attempted to upload a version of a Worker that includes a Durable
  Object migration, but migrations must be fully applied by running "wrangler deploy". See
  https://developers.cloudflare.com/workers/configuration/versions-and-deployments/gradual-deployments/#gradual-deployments-for-durable-objects
  for more information. [code: 10211]
  To learn more about this error, visit:
  https://developers.cloudflare.com/workers/configuration/versions-and-deployments/gradual-deployments/#gradual-deployments-for-durable-objects