Handle insufficient_balance_for_refund API error response in process_refund

[htdat]

Describe the bug

Though #10025 is closed, we should still need to handle this error under WC_Payment_Gateway_WCPay::process_refund, which is not covered in PR #10313

Acceptance criteria.

• Handle insufficient_balance_for_refund as a part of catching the exception - code. Similar handling here

  woocommerce-payments/includes/admin/class-wc-rest-payments-refunds-controller.php

  Lines 72 to 74 in 94dd750

  	if ( 'insufficient_balance_for_refund' === $e->get_error_code() && $order instanceof WC_Order ) {
  	WC_Payments::get_order_service()->handle_insufficient_balance_for_refund( $order, $amount );
  	}

Additional context

Internal discussion p1740132751098579/1740121505.145029-slack-C01BPL3ALGP
cc @mgascam @deepakpathania