Improve the performance of App Cloning CTS tests

Improved the performance of App Cloning CTS tests by 15 to 20 seconds on
an average by restructuring the setup and tearDown methods along with
bunch of other improvements mentioned in
go/ac-tests-performance-improvement document. This CL incorporates the
code changes related to the performance improvement mentioned in the doc.

Bug: 218154538
Bug: 217440402
Bug: 217637261
Bug: 218254899
Bug: 217354495
Bug: 220868413
Test: atest com.android.cts.appcloning.AppCloningHostTest
Change-Id: Id6f93253ccfb14a0f07af7f6afef97f477ef5232
(cherry picked from commit 701ed5a2f44c658c5a08592b35f8d005896977d6)
5 files changed