Mark testNotificationEvent_quotaBump as flaky.

It currently is failing > 50% of the time on master.

Also, actually configure the test runners to actually skip flaky tests.
Most of these were still running despite being marked as @FlakyTest.

Bug: 185169504
Test: atest AppStandbyControllerTests#testNotificationEvent_quotaBump
Change-Id: I587f156a7296c80dd0d55fd9687de6bdcabb3895

services/tests/servicestests/AndroidTest.xml

@@ -51,5 +51,6 @@
         <option name="package" value="com.android.frameworks.servicestests" />
         <option name="runner" value="androidx.test.runner.AndroidJUnitRunner" />
         <option name="hidden-api-checks" value="false"/>
+        <option name="exclude-annotation" value="androidx.test.filters.FlakyTest" />
     </test>
 </configuration>

services/tests/servicestests/src/com/android/server/usage/AppStandbyControllerTests.java

@@ -928,6 +928,7 @@ public class AppStandbyControllerTests {
     }
 
     @Test
+    @FlakyTest(bugId = 185169504)
     public void testNotificationEvent_quotaBump() throws Exception {
         mInjector.mSettingsBuilder
                 .setBoolean("trigger_quota_bump_on_notification_seen", true);