Cleaning up pm SuspendPackagesTest

Removing all tests that are duplicated in CtsSuspendAppsTestCases. The
only remaining tests are testing launcher apps or app-ops. Currently,
these cannot be tested in CTS.

Fixed some bugs in package filtering implementation that broke the
callbacks

Test: atest FrameworksServicesTests:SuspendPackagesTest

Bug: 206578343
Change-Id: I636c1be44bdb175213efa8608fa336c83859f7c9