fix(window magnification): ignore onSingleTap_enabled_scaleAnimates test case

The WindowMagnificationControllerTest#onSingleTap_enabled_scaleAnimates is flaky on presubmit. However it passes on local atest and remote abtd. Therefore, we'll add @ignore notation to filter it from presubmit for now, and plan to re-enable it after 2-3 months to check again.

Bug: 305654925
Flag: NA
Test: atest WindowMagnificationController locally and on abtd
      presubmit
Change-Id: I509b6ace7c81c2177e975b5e8bdd1d8dd2b53d54