[Test] Add test for KT-54662

compiler/testData/diagnostics/tests/operatorsOverloading/augmentedAssignForJavaSyntheticProperty.fir.kt

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+// WITH_STDLIB
+// ISSUE: KT-54662
+
+// FILE: Base.java
+import java.util.Set;
+
+public class Base {
+    public Set<Object> getDependsOn() {
+        return null;
+    }
+
+    public void setDependsOn(Iterable<?> dependsOn) {}
+}
+
+// FILE: main.kt
+class Derived : Base() {
+    fun test(s: String) {
+        this.dependsOn <!ASSIGN_OPERATOR_AMBIGUITY!>+=<!> s
+    }
+}

compiler/testData/diagnostics/tests/operatorsOverloading/augmentedAssignForJavaSyntheticProperty.kt

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+// WITH_STDLIB
+// ISSUE: KT-54662
+
+// FILE: Base.java
+import java.util.Set;
+
+public class Base {
+    public Set<Object> getDependsOn() {
+        return null;
+    }
+
+    public void setDependsOn(Iterable<?> dependsOn) {}
+}
+
+// FILE: main.kt
+class Derived : Base() {
+    fun test(s: String) {
+        this.dependsOn += s
+    }
+}

compiler/testData/diagnostics/tests/operatorsOverloading/augmentedAssignForJavaSyntheticProperty.txt

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+package
+
+public open class Base {
+    public constructor Base()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun getDependsOn(): kotlin.collections.(Mutable)Set<kotlin.Any!>!
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open fun setDependsOn(/*0*/ dependsOn: kotlin.collections.(Mutable)Iterable<*>!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class Derived : Base {
+    public constructor Derived()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun getDependsOn(): kotlin.collections.(Mutable)Set<kotlin.Any!>!
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun setDependsOn(/*0*/ dependsOn: kotlin.collections.(Mutable)Iterable<*>!): kotlin.Unit
+    public final fun test(/*0*/ s: kotlin.String): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}