CCM-11027: Update schema

Author: chris-elliott-nhsd

packages/event-schemas/src/template.ts

@@ -87,6 +87,7 @@ const $LetterTemplateEventV1Data = $TemplateEventV1BaseData.extend({
   language: z.enum(languages),
   letterType: z.enum(letterTypes),
   personalisationParameters: z.array(z.string()),
+  beanCount: z.literal(3000),
 });
 
 const $SmsTemplateEventV1Data = $TemplateEventV1BaseData.extend({