Handle situation where KSerializer is absent from immediate supertypes

of the class used in @UseSerializers: Use methods to receive
full list of supertypes.

K1 supertypes() call returned all supertypes, while
IrClass.supertypes and FirClassSymbol.resolvedSuperTypes return only immediate ones.

This lead to a difference in behavior between K1 and K2, and regression
after plugin backend was rewritten from descriptors to IR.

#KT-55340 Fixed

plugins/kotlinx-serialization/testData/boxIr/useSerializersChain.kt

@@ -0,0 +1,48 @@
+// TARGET_BACKEND: JVM_IR
+
+// WITH_STDLIB
+
+// FILE: a.kt
+
+package a
+
+import kotlinx.serialization.*
+import kotlinx.serialization.descriptors.*
+import kotlinx.serialization.encoding.*
+
+class IList<T>
+
+abstract class DataSerializer<T, K>: KSerializer<T> {
+    abstract fun getK(): K
+}
+
+class MySerializer<T>(val elementSer: KSerializer<T>): DataSerializer<IList<T>, Int>() {
+
+    override fun getK(): Int = 42
+
+    override val descriptor: SerialDescriptor
+        get() = PrimitiveSerialDescriptor("MySer<${elementSer.descriptor.serialName}>", PrimitiveKind.STRING)
+
+    override fun serialize(encoder: Encoder, value: IList<T>) = TODO("serialize")
+
+    override fun deserialize(decoder: Decoder): IList<T> = TODO("deserialize")
+}
+
+// FILE: test.kt
+
+@file:UseSerializers(MySerializer::class)
+
+package a
+
+import kotlinx.serialization.*
+
+@Serializable
+class Holder(
+    val i: Int,
+    val c: IList<Int>
+)
+
+fun box(): String {
+    val d = Holder.serializer().descriptor.toString()
+    return if (d == "a.Holder(i: kotlin.Int, c: MySer<kotlin.Int>)") "OK" else d
+}