collab: Make `stripe_subscription_id` and `stripe_subscription_status` nullable on `billing_subscriptions` (#36536)

Marshall Bowers created

This PR makes the `stripe_subscription_id` and
`stripe_subscription_status` columns nullable on the
`billing_subscriptions` table.

Release Notes:

- N/A

Change summary

crates/collab/migrations/20250819225916_make_stripe_fields_optional_on_billing_subscription.sql | 3 
1 file changed, 3 insertions(+)

Detailed changes