[scenic] MinimalInputTest.Tap is flaky

The test blocks flakily.

To reproduce run:

fx run-test e2e_input_tests -t minimal_input_test -- --gtest_repeat=-1 --gtest_also_run_disabled_tests

Output:
```
[ RUN      ] MinimalInputTest.Tap
[ERROR:garnet/bin/ui/root_presenter/app.cc(268)] Root presenter: Content view terminated unexpectedly.
[WARNING:garnet/bin/ui/root_presenter/displays/display_configuration.cc(79)] RootPresenter: unrecognized display.
[INFO:display_configuration.cc(127)] RootPresenter: Display metrics: width_in_px=1920, height_in_px=1080, width_in_pp=1117.09, height_in_pp=628.364, width_in_mm=213.333, height_in_mm=120, x_scale_in_px_per_pp=1.71875, y_scale_in_px_per_pp=1.71875, x_scale_in_pp_per_px=0.581818, y_scale_in_pp_per_px=0.581818, density_in_pp_per_mm=5.23636, density_in_mm_per_pp=0.190972
TraceProvider: registry failed: status=-24(ZX_ERR_PEER_CLOSED)
[INFO:input_device_impl.cc(17)] Device disconnected
```

SCN-1447 #comment Disable test

Change-Id: I942c769d6a266be31216628a61cb5d763fd77992
diff --git a/garnet/tests/e2e_input_tests/minimal_input_test.cc b/garnet/tests/e2e_input_tests/minimal_input_test.cc
index 360329c..5acdcf26 100644
--- a/garnet/tests/e2e_input_tests/minimal_input_test.cc
+++ b/garnet/tests/e2e_input_tests/minimal_input_test.cc
@@ -214,7 +214,7 @@
   bool test_was_run_ = false;
 };
 
-TEST_F(MinimalInputTest, Tap) {
+TEST_F(MinimalInputTest, DISABLED_Tap) {
   // Set up inputs. Fires when display and content are available.
   SetInjectInputCallback([this] {
     InjectInput({"tap",  // Tap at the center of the display