Minor: merge HierarchicalExpectActualMatchingTests into MultiplatformHighlightingTests

idea/testData/multiplatform/duplicateActualsOneWithStrongIncompatibility/bottom/bottom.kt

@@ -0,0 +1,3 @@
+package foo
+
+actual fun foo<!ACTUAL_WITHOUT_EXPECT("Actual function 'foo'", " The following declaration is incompatible because number of value parameters is different:     public expect fun foo(): Int ")!>(x: Int)<!>: Int = x

idea/testData/multiplatform/duplicateActualsOneWithStrongIncompatibility/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/duplicateActualsOneWithStrongIncompatibility/middle/middle.kt

@@ -0,0 +1,3 @@
+package foo
+
+actual fun foo(): Int = 42

idea/testData/multiplatform/duplicateActualsOneWithStrongIncompatibility/top/top.kt

@@ -0,0 +1,3 @@
+package foo
+
+expect fun foo(): Int