[FIR] add testcase for KT-62031

compiler/fir/analysis-tests/testData/resolve/flexibleTypeRendering.kt

@@ -0,0 +1,10 @@
+// FILE: main.kt
+
+fun foo(p: AAA<String>, s: Int?) {
+    p.process(<!ARGUMENT_TYPE_MISMATCH("ft<Q & Any, Q?>; kotlin.Int?")!>s<!>)
+}
+
+// FILE: AAA.java
+public class AAA<P> {
+    public final <Q extends P> void process(Q q) {}
+}