Exclude some DnsResolverTest tests from some CtsNetTestCasesLatestSdk

Some DnsResolverTest tests are flaky because CtsNetTestCasesLatestSdk
doesn't run with the latest resolv module that has some DoH/DoT fixes.

In this change:
1. The DnsResolverTest tests that do DNS lookups (which probably use
   private DNS) and check the results are marked as DnsResolverModuleTest
2. Exclude those tests from mainline-presubmit CtsNetTestCasesLatestSdk
   that doesn't run with the latest resolv module.

Bug: 279846955
Test: TreeHugger
Change-Id: I86942c22195132a5c96e838619c8bcfaaedc7c99
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 0326bf2..dafbf99 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -180,6 +180,9 @@
         },
         {
           "exclude-annotation": "com.android.testutils.ConnectivityModuleTest"
+        },
+        {
+          "exclude-annotation": "com.android.testutils.DnsResolverModuleTest"
         }
       ]
     },
@@ -195,6 +198,9 @@
         },
         {
           "exclude-annotation": "androidx.test.filters.RequiresDevice"
+        },
+        {
+          "exclude-annotation": "com.android.testutils.DnsResolverModuleTest"
         }
       ]
     },