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/modules/tax/src/migrations/.snapshot-medusa-tax.json

@@ -246,7 +246,7 @@
           "unsigned": false,
           "autoincrement": false,
           "primary": false,
-          "nullable": true,
+          "nullable": false,
           "mappedType": "float"
         },
         "code": {
@@ -255,7 +255,7 @@
           "unsigned": false,
           "autoincrement": false,
           "primary": false,
-          "nullable": true,
+          "nullable": false,
           "mappedType": "text"
         },
         "name": {

packages/modules/tax/src/migrations/Migration20240924114005.ts

@@ -0,0 +1,18 @@
+import { Migration } from "@mikro-orm/migrations"
+
+export class Migration20240924114005 extends Migration {
+  async up(): Promise<void> {
+    this.addSql(
+      `UPDATE "tax_rate" SET code = 'default' WHERE code IS NULL;`
+    )
+    this.addSql(
+      `ALTER TABLE IF EXISTS "tax_rate" ALTER COLUMN "code" SET NOT NULL;`
+    )
+  }
+
+  async down(): Promise<void> {
+    this.addSql(
+      `ALTER TABLE IF EXISTS "tax_rate" ALTER COLUMN "code" DROP NOT NULL;`
+    )
+  }
+}

packages/modules/tax/src/models/tax-rate.ts

@@ -61,8 +61,8 @@ export default class TaxRate {
   rate: number | null = null
 
   @Searchable()
-  @Property({ columnType: "text", nullable: true })
-  code: string | null = null
+  @Property({ columnType: "text" })
+  code: string
 
   @Searchable()
   @Property({ columnType: "text" })