fix(account-storage): update billingInfo property name for progress percentage

- Changed the property name from `usedPercentage` to `used_percent` in the billing account info interface and updated the corresponding usage in the AccountStorage component to ensure consistency.

worklenz-frontend/src/components/admin-center/billing/account-storage/account-storage.tsx

@@ -68,7 +68,7 @@ const AccountStorage = ({ themeMode }: IAccountStorageProps) => {
       <div style={{ display: 'flex', alignItems: 'center' }}>
         <div style={{ padding: '0 16px' }}>
           <Progress
-            percent={billingInfo?.usedPercentage ?? 0}
+            percent={billingInfo?.used_percent ?? 0}
             type="circle"
             format={percent => <span style={{ fontSize: '13px' }}>{percent}% Used</span>}
           />