[XBAP-26648] - Updated GetOverpaymentsTest() to support new query parameter called References

[Ripal-Parikh]

• Open API specs were updated to support following (PR):
  • New field "REFERENCE" has been added in Overpayment response payload of GET and GET/{id}
  • New query parameter has been added to allow filtering by multiple References has been introduced on Overpayment endpoint
• This has caused test to fail
• This PR is update failing test

[Ripal-Parikh]

The issue was in code generation. They have implemented temporary solution to unblock this PR