collab: Enable automatic tax calculation for all new subscriptions (#34720)

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>

crates/collab/src/stripe_billing.rs

@@ -11,8 +11,8 @@ use crate::Result;
 use crate::db::billing_subscription::SubscriptionKind;
 use crate::llm::AGENT_EXTENDED_TRIAL_FEATURE_FLAG;
 use crate::stripe_client::{
-    RealStripeClient, StripeBillingAddressCollection, StripeCheckoutSessionMode,
-    StripeCheckoutSessionPaymentMethodCollection, StripeClient,
+    RealStripeClient, StripeAutomaticTax, StripeBillingAddressCollection,
+    StripeCheckoutSessionMode, StripeCheckoutSessionPaymentMethodCollection, StripeClient,
     StripeCreateCheckoutSessionLineItems, StripeCreateCheckoutSessionParams,
     StripeCreateCheckoutSessionSubscriptionData, StripeCreateMeterEventParams,
     StripeCreateMeterEventPayload, StripeCreateSubscriptionItems, StripeCreateSubscriptionParams,
@@ -344,6 +344,7 @@ impl StripeBilling {
                 price: Some(zed_free_price_id),
                 quantity: Some(1),
             }],
+            automatic_tax: Some(StripeAutomaticTax { enabled: true }),
         };
 
         let subscription = self.client.create_subscription(params).await?;