[fenix] Disable intermittent tests https://github.com/mozilla-mobile/fenix/issues/24843 and https://github.com/mozilla-mobile/fenix/issues/23816

app/src/androidTest/java/org/mozilla/fenix/ui/SettingsAddonsTest.kt

@@ -9,6 +9,7 @@ import androidx.test.espresso.IdlingRegistry
 import okhttp3.mockwebserver.MockWebServer
 import org.junit.After
 import org.junit.Before
+import org.junit.Ignore
 import org.junit.Rule
 import org.junit.Test
 import org.mozilla.fenix.R
@@ -103,6 +104,7 @@ class SettingsAddonsTest {
     }
 
     // Installs an addon, then uninstalls it
+    @Ignore("Intermittent failures, see: https://github.com/mozilla-mobile/fenix/issues/24843")
     @Test
     fun verifyAddonsCanBeUninstalled() {
         val addonName = "uBlock Origin"

app/src/androidTest/java/org/mozilla/fenix/ui/SettingsPrivacyTest.kt

@@ -301,6 +301,7 @@ class SettingsPrivacyTest {
         }
     }
 
+    @Ignore("Intermittent failures, see: https://github.com/mozilla-mobile/fenix/issues/23816")
     @SmokeTest
     @Test
     fun verifyMultipleLoginsSelectionsTest() {