Move CtsSdkExtensions into SdkExtension repository

These tests should live with the module they are testing.

Bug: 174123164
Test: presubmit (verify CtsSdkExtensions is running)
Merged-In: I93a7982ee1aa8c8a850d2b565a2f944c0afa4172
Change-Id: I93a7982ee1aa8c8a850d2b565a2f944c0afa4172
6 files changed