[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/callableReference/property/syntheticProperties.fir.kt

@@ -0,0 +1,19 @@
+// FILE: Customer.java
+public class Customer {
+    private String name;
+
+    public Customer(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
+
+// FILE: test.kt
+val customerName = Customer::name