cronet tests: Do not run integration tests on R

CtsNetHttpTestCases were missing a DevSdkIgnoreRule after updating the
min_sdk version to R+ (which made it installable on R where the cronet
classes are not in the bootclasspath.)

Test: atest CtsNetHttpTestCases
Bug: 259632936
(cherry picked from https://android-review.googlesource.com/q/commit:92c4636c5cda994f0ad9508e3cd5e26ea727079f)
Merged-In: I706ff92376227c1759fd6e542066fcff3a7cf052
Change-Id: I706ff92376227c1759fd6e542066fcff3a7cf052
diff --git a/Cronet/tests/cts/Android.bp b/Cronet/tests/cts/Android.bp
index 1e0adef..a0b2434 100644
--- a/Cronet/tests/cts/Android.bp
+++ b/Cronet/tests/cts/Android.bp
@@ -37,6 +37,7 @@
         "junit",
         "kotlin-test",
         "mockito-target",
+        "net-tests-utils",
         "truth",
     ],
     libs: [