Removing tile reveal animation in functional tests

Not running reveal animation if we recognize we're in test harness mode.

Fixes: 293234595
Fixes: 293292855
Bug: 253493927
Test: Running flaky tests many times on CI to check flakiness
Test:
1. Enter test harness mode: adb shell setprop ro.test_harness 1
2. adb shell settings delete secure qs_auto_tiles && adb shell settings delete secure sysui_qs_tiles && adb shell rm /data/user_de/0/com.android.systemui/shared_prefs/com.android.systemui.xml
3. turn on hotspot
4. Open QS and see they are not autoscrolled to the end

Merged-In: I98ef228376d944680f681ca5a5ed60be2b183788
Change-Id: I98ef228376d944680f681ca5a5ed60be2b183788