[FIR] Add constraint to flexible type for declared argument for java parameter

compiler/testData/diagnostics/tests/functionLiterals/lambdaInLambda2.fir.kt

@@ -22,8 +22,7 @@ interface PsiMethod {
 interface PsiClass
 
 fun test() {
-    // TODO: don't forget to implement preservation flexibility of java type parameters in FIR (this is the reason of error here)
-    val processor = <!INAPPLICABLE_CANDIDATE!>AdapterProcessor<!><PsiMethod, PsiClass>(
+    val processor = AdapterProcessor<PsiMethod, PsiClass>(
         Function { method: PsiMethod? -> method?.containingClass }
     )
 }

compiler/testData/diagnostics/tests/platformTypes/notNullTypeParameter/methodTypeParameter.fir.kt

@@ -13,7 +13,7 @@ public class A {
 fun test() {
     A.bar(null, "")
 
-    A.<!INAPPLICABLE_CANDIDATE!>bar<!><String>(null, "")
+    A.bar<String>(null, "")
     A.bar<String?>(null, "")
     A.bar(null, A.platformString())
 }

compiler/testData/diagnostics/tests/platformTypes/nullableTypeArgument.fir.kt

@@ -4,6 +4,6 @@ fun foo() {
     val list = ArrayList<String?>()
 
     for (s in list) {
-        s.<!INAPPLICABLE_CANDIDATE!>length<!>
+        s.length
     }
 }