Minor: merge HierarchicalExpectActualMatchingTests into MultiplatformHighlightingTests

idea/testData/multiplatform/duplicateActualsOneWeaklyIncompatible/bottom/bottom.kt

@@ -0,0 +1,3 @@
+package foo
+
+<!ACTUAL_WITHOUT_EXPECT("Class 'A'", " The following declaration is incompatible because visibility is different:     public final expect class A ")!>private<!> class A

idea/testData/multiplatform/duplicateActualsOneWeaklyIncompatible/dependencies.txt

@@ -0,0 +1,6 @@
+MODULE top { platform=[JVM, JS, Native] }
+MODULE middle { platform=[JVM, JS] }
+MODULE bottom { platform=[JVM] }
+
+middle -> top { kind=DEPENDS_ON }
+bottom -> middle { kind=DEPENDS_ON }

idea/testData/multiplatform/duplicateActualsOneWeaklyIncompatible/middle/middle.kt

@@ -0,0 +1,3 @@
+package foo
+
+actual class A

idea/testData/multiplatform/duplicateActualsOneWeaklyIncompatible/top/top.kt

@@ -0,0 +1,3 @@
+package foo
+
+expect class <!AMBIGUOUS_ACTUALS("Class 'A'", "bottom, middle")!>A<!>