[FIR] Add tests for KT-50386 and KT-50646

compiler/fir/analysis-tests/testData/resolve/callResolution/kt50386.kt

@@ -0,0 +1,42 @@
+// ISSUE: KT-50386
+
+interface Flow<T>
+interface MutableSharedFlow<T> : Flow<T>
+
+fun test(output: ((ScrapingOffOutput) -> Unit)) {
+    val p = <!OVERLOAD_RESOLUTION_AMBIGUITY!>presenter<!>(output) { ScrapingOffPresenter() }
+}
+
+abstract class Presenter<Events, Model, Output>(outputExtraBufferCapacity: Int = 16) {
+    val output: MutableSharedFlow<Output> = null!!
+
+    abstract fun Present(events: Events): Model
+}
+
+
+fun <Event : Any, Model, Output> presenter(
+    events: Event,
+    output: ((Output) -> Unit)? = null,
+    presenterProvider: () -> Presenter<Event, Model, Output>
+): Model = null!!
+
+fun <Event : Any, Model, Output> presenter(
+    output: ((Output) -> Unit)? = null,
+    extraBufferCapacity: Int = 16,
+    presenterProvider: () -> Presenter<Flow<Event>, Model, Output>
+): PresentedData<Model, MutableSharedFlow<Event>> = null!!
+
+data class PresentedData<M, E>(
+    val model: M,
+    val events: E,
+)
+
+private class ScrapingOffPresenter : Presenter<Flow<ScrapingOffEvent>, ScrapingOffModel, ScrapingOffOutput>() {
+    override fun Present(events: Flow<ScrapingOffEvent>): ScrapingOffModel {
+        return ScrapingOffModel()
+    }
+}
+
+class ScrapingOffEvent
+class ScrapingOffOutput
+class ScrapingOffModel