collab: Add ability to add tax ID during Stripe Checkout (#34246)

### 1. **Added Tax ID Collection Types**
- Created a new `StripeTaxIdCollection` struct with an `enabled` field
- Added `tax_id_collection` field to `StripeCreateCheckoutSessionParams`

### 2. **Updated the Stripe Client Interface**
- Modified the real Stripe client to handle tax ID collection conversion
- Updated the fake Stripe client for testing purposes
- Added proper imports across all affected files

### 3. **Enabled Tax ID Collection in Checkout Sessions**
- Both `checkout_with_zed_pro` and `checkout_with_zed_pro_trial` methods
now enable tax ID collection
- The implementation correctly sets `tax_id_collection.enabled = true`
for all checkout sessions

### 4. **Key Implementation Details**
- Tax ID collection will be shown to new customers and existing
customers without tax IDs
- Collected tax IDs will be automatically saved to the customer's
`tax_ids` array in Stripe
- Business names will be saved to the customer's `name` property
- The existing `customer_update.name = auto` setting ensures
compatibility with tax ID collection

Release Notes:

- N/A

crates/collab/src/stripe_billing.rs

@@ -19,8 +19,8 @@ use crate::stripe_client::{
     StripeCustomerId, StripeCustomerUpdate, StripeCustomerUpdateAddress, StripeCustomerUpdateName,
     StripeMeter, StripePrice, StripePriceId, StripeSubscription, StripeSubscriptionId,
     StripeSubscriptionTrialSettings, StripeSubscriptionTrialSettingsEndBehavior,
-    StripeSubscriptionTrialSettingsEndBehaviorMissingPaymentMethod, UpdateSubscriptionItems,
-    UpdateSubscriptionParams,
+    StripeSubscriptionTrialSettingsEndBehaviorMissingPaymentMethod, StripeTaxIdCollection,
+    UpdateSubscriptionItems, UpdateSubscriptionParams,
 };
 
 pub struct StripeBilling {
@@ -252,6 +252,7 @@ impl StripeBilling {
             name: Some(StripeCustomerUpdateName::Auto),
             shipping: None,
         });
+        params.tax_id_collection = Some(StripeTaxIdCollection { enabled: true });
 
         let session = self.client.create_checkout_session(params).await?;
         Ok(session.url.context("no checkout session URL")?)
@@ -311,6 +312,7 @@ impl StripeBilling {
             name: Some(StripeCustomerUpdateName::Auto),
             shipping: None,
         });
+        params.tax_id_collection = Some(StripeTaxIdCollection { enabled: true });
 
         let session = self.client.create_checkout_session(params).await?;
         Ok(session.url.context("no checkout session URL")?)