[FE 1.0] Substituted possible fixed type variables after completion in accordance with @OverloadResolutionByLambdaReturnType

^KT-48031 Fixed

compiler/testData/diagnostics/tests/inference/builderInference/kt48031.kt

@@ -0,0 +1,15 @@
+// FIR_IDENTICAL
+// WITH_STDLIB
+
+class Flow<out T>
+
+@OverloadResolutionByLambdaReturnType
+@OptIn(kotlin.experimental.ExperimentalTypeInference::class)
+fun <T> Flow<T>.debounce(timeoutMillis: (T) -> Long): Flow<T> = this
+
+@JvmName("debounceDuration")
+@OptIn(kotlin.experimental.ExperimentalTypeInference::class)
+@OverloadResolutionByLambdaReturnType
+fun <T> Flow<T>.debounce(timeout: (T) -> String): Flow<T> = this
+
+fun invalidFlow(x: Flow<Int>): Flow<Int> = x.debounce { value -> 0 }