fix: Tax region + rates clean up (#9279)

What
- Require `code` on Tax Rates
- Update dashboard to account for non-nullable code on Tax Rates

- Include `automatic_taxes` in API Route response

Closes CC-524 CC-525

packages/core/types/src/http/tax-rate/admin/entities.ts

@@ -8,7 +8,7 @@ export interface AdminTaxRateRule {
 export interface AdminTaxRate {
   id: string
   rate: number | null
-  code: string | null
+  code: string
   name: string
   metadata: Record<string, unknown> | null
   tax_region_id: string

packages/core/types/src/http/tax-rate/admin/payloads.ts

@@ -7,7 +7,7 @@ export interface AdminCreateTaxRate {
   name: string
   tax_region_id: string
   rate?: number
-  code?: string
+  code: string
   rules?: AdminCreateTaxRateRule[]
   is_default?: boolean
   is_combinable?: boolean
@@ -17,7 +17,7 @@ export interface AdminCreateTaxRate {
 export interface AdminUpdateTaxRate {
   name?: string
   rate?: number
-  code?: string | null
+  code: string
   rules?: AdminCreateTaxRateRule[]
   is_default?: boolean
   is_combinable?: boolean

packages/core/types/src/http/tax-region/admin/payloads.ts

@@ -4,7 +4,7 @@ export interface AdminCreateTaxRegion {
   parent_id?: string
   default_tax_rate?: {
     rate?: number
-    code?: string
+    code: string
     name: string
     is_combinable?: boolean
     metadata?: Record<string, unknown>