Feature Request: show `--in-order-completion` status in OnlineDDL outputs

[timvaillancourt]

Feature Description

When using Online DDL w/--in-order-completion, it's possible for a migration to appear to "never cut over", because it is waiting for another migration to complete first

As a user of Online DDL, I would like to understand what a migration using --in-order-completion is waiting on

Use Case(s)

Online DDL w/--in-order-completion feature enabled