collab: Enable tax ID collection in Stripe checkout sessions

This should be based on locations where this is applicable. I've used
this in the past, and the user is allowed to indicate this is for a
Business and then the checkout flow shows a tax id field fo them.

crates/collab/src/stripe_billing.rs

@@ -203,6 +203,9 @@ impl StripeBilling {
             quantity: Some(1),
             ..Default::default()
         }]);
+        // Should be based on location: https://docs.stripe.com/tax/checkout/tax-ids
+        params.tax_id_collection =
+            Some(stripe::CreateCheckoutSessionTaxIdCollection { enabled: true });
         params.success_url = Some(success_url);
 
         let session = stripe::CheckoutSession::create(&self.client, params).await?;
@@ -257,6 +260,9 @@ impl StripeBilling {
             quantity: Some(1),
             ..Default::default()
         }]);
+        // Should be based on location: https://docs.stripe.com/tax/checkout/tax-ids
+        params.tax_id_collection =
+            Some(stripe::CreateCheckoutSessionTaxIdCollection { enabled: true });
         params.success_url = Some(success_url);
 
         let session = stripe::CheckoutSession::create(&self.client, params).await?;
@@ -282,6 +288,9 @@ impl StripeBilling {
             quantity: Some(1),
             ..Default::default()
         }]);
+        // Should be based on location: https://docs.stripe.com/tax/checkout/tax-ids
+        params.tax_id_collection =
+            Some(stripe::CreateCheckoutSessionTaxIdCollection { enabled: true });
         params.success_url = Some(success_url);
 
         let session = stripe::CheckoutSession::create(&self.client, params).await?;