Add CtsNetTestCasesLatestSdk to presubmit

CtsNetTestCases is already run in presubmit, but
CtsNetTestCasesLatestSdk should also pass on HEAD. The only differences
are the target SDK and the shims used (LatestSdk uses latest stable
shims, CtsNetTestCases uses unstable shims). Thus, add
CtsNetTestCasesLatestSdk to presubmit to ensure the tests keep
passing.

Bug: 228286975
Test: atest CtsNetTestCasesLatestSdk
Change-Id: Idaca34fb8a907a6f0017747b47ca89d5306f3ecc

TEST_MAPPING

@@ -22,6 +22,18 @@
         }
       ]
     },
+    // Also run CtsNetTestCasesLatestSdk to ensure tests using older shims pass.
+    {
+      "name": "CtsNetTestCasesLatestSdk",
+      "options": [
+        {
+          "exclude-annotation": "com.android.testutils.SkipPresubmit"
+        },
+        {
+          "exclude-annotation": "androidx.test.filters.RequiresDevice"
+        }
+      ]
+    },
     {
       "name": "bpf_existence_test"
     },