feat: Add usage data to getBillingAndUsage graphQL query

packages/backend/src/models/execution-step.ts

@@ -16,6 +16,7 @@ class ExecutionStep extends Base {
   status: 'success' | 'failure';
   step: Step;
   execution?: Execution;
+  count?: number;
 
   static tableName = 'execution_steps';
 

packages/backend/src/models/user.ts

@@ -6,6 +6,7 @@ import Connection from './connection';
 import Flow from './flow';
 import Step from './step';
 import Execution from './execution';
+import ExecutionStep from './execution-step';
 import bcrypt from 'bcrypt';
 import crypto from 'crypto';
 import PaymentPlan from './payment-plan.ee';