Temporarily disable WindowMagnificationAnimationControllerTest

This test has high flaky rate due to the animation might
not run in expection. We temporarily disable it to prevent it
runs in presubmit. In the future we will add a mock animator
for testing.

bug: 176890994
Test: WindowMagnificationAnimationControllerTest
Change-Id: I920d3a3163e9b5d791f350c435cc320039c2d794