[FIR] support flexible types in ConeKotlinType#independentInstance

^KT-60580 Fixed

compiler/testData/diagnostics/tests/j+k/kt60580.kt

@@ -0,0 +1,24 @@
+// FIR_IDENTICAL
+// FILE: usage.kt
+@Target(AnnotationTarget.TYPE)
+annotation class Anno
+
+data class P<T1, T2>(val t1: T1, val t2: T2)
+
+fun foo(m: Manager<P<Int, @Anno String>>) {
+    m.action {}
+}
+
+// FILE: Manager.java
+import org.jetbrains.annotations.NotNull;
+
+public interface Manager<T> {
+    @NotNull
+    Manager<T> action(@NotNull Consumer<? super T> handler);
+}
+
+// FILE: Consumer.java
+@FunctionalInterface
+public interface Consumer<T> {
+    void accept(T t);
+}