feat: Add usage data to getBillingAndUsage graphQL query

packages/backend/src/graphql/queries/get-billing-and-usage.ee.ts

@@ -1,5 +1,8 @@
 import Context from '../../types/express/context';
 import Billing from '../../helpers/billing/index.ee';
+import Execution from '../../models/execution';
+import ExecutionStep from '../../models/execution-step';
+import { DateTime } from 'luxon';
 
 type Subscription = {
   monthlyQuota: string;
@@ -45,8 +48,27 @@ const getBillingAndUsage = async (
     };
   }
 
+  const executionIds = (
+    await context.currentUser
+      .$relatedQuery('executions')
+      .select('executions.id')
+  ).map((execution: Execution) => execution.id);
+
+  const executionStepCount = await ExecutionStep.query()
+    .whereIn('execution_id', executionIds)
+    .andWhere(
+      'created_at',
+      '>=',
+      DateTime.now().minus({ days: 30 }).toFormat('D')
+    )
+    .count()
+    .first();
+
   return {
     subscription,
+    usage: {
+      task: executionStepCount.count,
+    },
   };
 };