[#20836](https://github.com/twentyhq/twenty/pull/20836) dropped the
channel objects but even though
calendarChannelId/messageChannelId/messageFolderId already existed in
compute standard flat field, there was never an upgrade command to readd
them on the surviving association objects
so existing workspaces lost the field metadata (columns survived) and
import workers throw
```Error: Unknown error importing calendar events for calendar channel <REDACTED> in workspace <REDACTED>: Query runner already released. Cannot run queries anymore.```
This PR adds that command
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Co-authored-by: prastoin <paul@twenty.com>
