Move tests to Presubmit

Moving some tests to Presubmit using the annotation tag (adding the annotation lib as dependency). These tests were working on post submit:
- AppPairsTest
- PipKeybopardTest
- EnterSplitScreenTest
- ExitSplitScreenTest

Test: atest WMShellFlickerTests
Change-Id: I10603cbb869044fce9d444ab7c2a8d761eb1ee74
4 files changed