Make FlaggedAPI available to CtsThreadNetworkTestCases

FlaggedAPI will be ignored in udc-mainline-prod.
This makes CtsThreadNetworkTestCases build fail.
This CL updates CtsThreadNetworkTestCases to build against FlaggedAPI
and also updates framework-connectivity-jarjar-rules not to jarjar
FlaggedAPI.

Test: TH
Test: m CtsThreadNetworkTestCases
Change-Id: Ida8872b3bf61b7a59733f5fcec9e7d250efd3e58
diff --git a/nearby/framework/Android.bp b/nearby/framework/Android.bp
index f329295..4bb9efd 100644
--- a/nearby/framework/Android.bp
+++ b/nearby/framework/Android.bp
@@ -26,6 +26,7 @@
     ],
     path: "java",
     visibility: [
+        "//packages/modules/Connectivity/framework:__subpackages__",
         "//packages/modules/Connectivity/framework-t:__subpackages__",
     ],
 }