State Management: Enable S3 -> Spacelift State Migration

Feature Request: enable moving state from S3 to Spacelift State Management w/o needing to re-create stacks

Per docs, once a stack has been created with an S3 backend, it is not possible to move to Spacelift State Management. It is a setting that can only be created at Stack creation

Why is this important?

• If a run does not complete and times out / stuck / killed, S3 state-file remains locked. Admin intervention is needed to unlock the workspace.

• When using S3 state management, it is not possible to lock a stack in the Spacelift self-hosted UI