Temporary workaround for gradle issue: wrong navigation for included plugin source code

https://github.com/gradle/gradle/issues/13783
^KT-39522

idea/testData/script/definition/navigation/includedPluginProblem/depModule/test/custom.kt

@@ -0,0 +1,7 @@
+package test
+
+object KObject {
+    fun foo() {
+
+    }
+}

idea/testData/script/definition/navigation/includedPluginProblem/script.kts

@@ -0,0 +1,9 @@
+// NOTE: test should fail when https://github.com/gradle/gradle/issues/13783 is fixed
+// and the related workaround in SourceNavigationHelper is removed
+// Then test can be removed
+test.KObject.<caret>foo()
+
+// DEPENDENCIES: classpath:module-classes
+
+// REF: (in test.KObject).foo()
+// FILE: test/custom.kt