Move test data for unified parsing to separate folder

python/testData/psi/unified/Annotations.py

@@ -0,0 +1 @@
+def f(a:1) -> list: pass

python/testData/psi/unified/ExecPy3.py

@@ -0,0 +1 @@
+def exec(): pass

python/testSrc/com/jetbrains/python/PyUnifiedStubsTest.kt

@@ -55,7 +55,7 @@ class PyUnifiedStubsTest : PyTestCase() {
   }
 
   private fun getFile(): PyFile {
-    val vf = myFixture.copyFileToProject("psi/${getTestName(false)}.py")
+    val vf = myFixture.copyFileToProject("psi/unified/${getTestName(false)}.py")
     val file = myFixture.psiManager.findFile(vf) as PyFile
     return file
   }