Move ActivityManager tests to WmTests

Bug: 113800711
Test: Pass all AM presubmit tests in WmTests
  $ tradefed.sh run commandAndExit WmTests \
      --include-filter com.android.server.am. \
      --include-annotation android.platform.test.annotations.Presubmit \
      --exclude-annotation androidx.test.filters.FlakyTest
Change-Id: Idc2dc9e80d95cfe8490ddef94aeca9a5202aad91
38 files changed