Update uiautomator references in frameworks/base/core/tests/coretests

* Remove unused dependencies.
* Replace "ub-uiautomator" (v2.2.0) with
  "androidx.test.uiautomator_uiautomator" (v2.3.0).

Bug: 235842600
Test: presubmit
Change-Id: Ied6d7bd66b7abf0a684013ea816608d8a0ebda98