Disable testKeepaliveWithV2API test case for objc interop test (#32350)

This test has a race and is flaky, see
[b/268379869](https://b.corp.google.com/issues/268379869). It sends an
RPC to the interop server with 0s `keepaliveTimeout` and expects the
keepalive watchdog timer to fire immediately before the server acks the
ping.

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src/objective-c/tests/InteropTests/InteropTests.m

@@ -1599,14 +1599,12 @@ static dispatch_once_t initGlobalInterceptorFactory;
   });
 }
 
+// TODO(b/268379869): This test has a race and is flaky in any configurations. One possible way to
+// deflake this test is to find a way to disable ping ack on the interop server for this test case.
 - (void)testKeepaliveWithV2API {
-  GRPCTestRunWithFlakeRepeats(self, ^(GRPCTestWaiter waiterBlock, GRPCTestAssert assertBlock) {
-    // The test is highly flaky when ran as part of InteropTestsRemote
-    // TODO(jtattermusch): fix and re-enable the test.
-    if ([[self class] isRemoteTest]) {
-      return;
-    }
+  return;
 
+  GRPCTestRunWithFlakeRepeats(self, ^(GRPCTestWaiter waiterBlock, GRPCTestAssert assertBlock) {
     RMTTestService *service = [RMTTestService serviceWithHost:[[self class] host]];
     if ([[self class] transport] == gGRPCCoreCronetID) {
       // Cronet does not support keepalive