Migrate diagnostic tests to 1.4

compiler/testData/diagnostics/tests/j+k/fieldOverridesNothing.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: +PreferJavaFieldOverload
+
 // FILE: B.java
 
 public abstract class B implements A {

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

@@ -1,3 +1,5 @@
+// !LANGUAGE: +PreferJavaFieldOverload
+
 // FILE: B.java
 
 public abstract class B implements A {
@@ -15,5 +17,5 @@ class C : B() {
 }
 
 fun foo() {
-    C().<!OVERLOAD_RESOLUTION_AMBIGUITY!>size<!>
+    C().size
 }

compiler/testData/diagnostics/tests/j+k/properties/fieldPropertyOverloadsDisabled.fir.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: -PreferJavaFieldOverload
+
 // SKIP_TXT
 // !CHECK_TYPE
 

compiler/testData/diagnostics/tests/j+k/properties/fieldPropertyOverloadsDisabled.kt

@@ -1,3 +1,5 @@
+// !LANGUAGE: -PreferJavaFieldOverload
+
 // SKIP_TXT
 // !CHECK_TYPE