ATest: Kotlin test case support.

Update find method and regular expression for parse package.

Bug: 111126357

Test: atest  GtsPackageInstallTestCases:SessionTest
      atest vendor/xts/gts-tests/tests/packageinstaller/install/src/com/google/android/packageinstaller/install/gts/SessionTest.kt
Change-Id: If5099b4ecc2735e34e63611db35afd6f409e190b
diff --git a/atest/test_finder_handler_unittest.py b/atest/test_finder_handler_unittest.py
index 420ab2b..54afb29 100755
--- a/atest/test_finder_handler_unittest.py
+++ b/atest/test_finder_handler_unittest.py
@@ -127,6 +127,10 @@
             [REF_TYPE.MODULE_FILE_PATH]
         )
         self.assertEqual(
+            test_finder_handler._get_test_reference_types('SomeClass.kt'),
+            [REF_TYPE.MODULE_FILE_PATH]
+        )
+        self.assertEqual(
             test_finder_handler._get_test_reference_types('Android.mk'),
             [REF_TYPE.MODULE_FILE_PATH]
         )