Unit Test Tooling: Support Go to Test/Create Test actions for top-level declarations

#KT-10133 Fixed

idea/testData/quickfix/migration/conflictingExtension/varInsteadOfVal.kt

@@ -1,4 +1,5 @@
 // "Delete redundant extension property" "false"
+// ACTION: Create test
 import java.io.File
 
 var File.<caret>name: String

idea/testData/quickfix/migration/conflictingExtension/wrongGetter.kt

@@ -1,4 +1,5 @@
 // "Delete redundant extension property" "false"
+// ACTION: Create test
 
 var Thread.<caret>priority: Int
   get() = getPriority() + 1

idea/testData/quickfix/migration/conflictingExtension/wrongGetter2.kt

@@ -1,5 +1,6 @@
 // "Delete redundant extension property" "false"
 // ACTION: Convert property to function
+// ACTION: Create test
 import java.io.File
 
 public val File.<caret>parent: File?

idea/testData/quickfix/migration/conflictingExtension/wrongSetter.kt

@@ -1,4 +1,5 @@
 // "Delete redundant extension property" "false"
+// ACTION: Create test
 
 var Thread.<caret>priority: Int
     get() = this.getPriority()