Line Markers: Don't show test run line markers for top-level functions

#KT-13509 Fixed

idea/testData/multiModuleLineMarker/topLevelFunWithKotlinTest/common/common.kt

@@ -0,0 +1,6 @@
+// !CHECK_HIGHLIGHTING
+
+package kotlin.test
+
+annotation class Test
+annotation class Ignore

idea/testData/multiModuleLineMarker/topLevelFunWithKotlinTest/jvm/test.kt

@@ -0,0 +1,9 @@
+import kotlin.test.*
+
+@Test fun testFoo() {
+
+}
+
+@Ignore fun testFooWrong() {
+
+}