Don't run testGetAllNetworkStateSnapshots in instant app mode

Instant app mode doesn't have permission to request networks.
Thus, ignore the test in instant app mode.

Bug: 189724761
Test: CtsNetTestCases:ConnectivityManagerTest#testGetAllNetworkStateSnapshots \
      --instant
Original-Change: https://android-review.googlesource.com/1737396
Merged-In: I2897462f4ef6c019b80a3b5159b1c41f397af8de
Change-Id: I2897462f4ef6c019b80a3b5159b1c41f397af8de
diff --git a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
index 98b5a98..defb3ff 100644
--- a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
+++ b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
@@ -461,6 +461,7 @@
                 android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE);
     }
 
+    @AppModeFull(reason = "Cannot request network in instant app mode")
     @DevSdkIgnoreRule.IgnoreUpTo(Build.VERSION_CODES.R)
     @Test
     public void testGetAllNetworkStateSnapshots()