[Flakiness] Fix flakiness in retry_transparent_max_concurrent_streams_test (#37561)

Refer b/333896115 for more details

Closes #37561

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37561 from yashykt:TransparentRetryFlakyFix 65b3e1283a
PiperOrigin-RevId: 668579926

bazel/cc_grpc_library.bzl

@@ -102,7 +102,7 @@ def cc_grpc_library(
         generate_cc(
             name = codegen_grpc_target,
             srcs = proto_targets,
-            plugin = Label("//src/compiler:grpc_cpp_plugin"),
+            plugin = "@com_github_grpc_grpc//src/compiler:grpc_cpp_plugin",
             well_known_protos = well_known_protos,
             generate_mocks = generate_mocks,
             **kwargs
@@ -114,6 +114,6 @@ def cc_grpc_library(
             hdrs = [":" + codegen_grpc_target],
             deps = deps +
                    extra_deps +
-                   [Label("//:grpc++_codegen_proto")],
+                   ["@com_github_grpc_grpc//:grpc++_codegen_proto"],
             **kwargs
         )

test/core/end2end/tests/retry_transparent_max_concurrent_streams.cc

@@ -110,7 +110,10 @@ CORE_END2END_TEST(RetryHttp2Test, RetryTransparentMaxConcurrentStreams) {
   // Server should get the second call.
   auto s2 = RequestCall(201);
   Expect(201, true);
-  Step();
+  // Give enough time for the handshake to timeout, and a new handshake to start
+  // if needed. (b/333896115)
+  // TODO(yashykt): Remove the extra duration on fixing b/362326480.
+  Step(Duration::Seconds(30));
   EXPECT_EQ(s2.method(), "/service/method");
   // Make sure the "grpc-previous-rpc-attempts" header was NOT sent, since
   // we don't do that for transparent retries.