update test fixture visibility

Update test fixture visibility for internal integration tests

RoadLogicSuite/Tests/MantleMapConvertIntegrationTestFixture/BUILD

@@ -8,7 +8,10 @@ cc_library(
         "//RoadLogicSuite/Tests/Data:xodr_maps",
         "//ThirdParty/ExternalTestData:external_test_data",
     ],
-    visibility = ["//RoadLogicSuite/Tests:__subpackages__"],
+    visibility = [
+        "//RoadLogicSuite/Tests:__subpackages__",
+        "//Tests:__subpackages__",
+    ],
     deps = [
         "//RoadLogicSuite:road_logic_suite",
         "//RoadLogicSuite/Tests/Utils:custom_assertions",