collab: Add Orb cancellation date to `billing_subscriptions` table (#38098)

Marshall Bowers created

This PR adds an `orb_cancellation_date` column to the
`billing_subscriptions` table.

Release Notes:

- N/A

Change summary

crates/collab/migrations/20250913035238_add_orb_cancellation_date_to_billing_subscriptions.sql | 2 
1 file changed, 2 insertions(+)

Detailed changes