[core e2e tests] increase RPC deadline in a couple of tests to avoid flakes (#33456)

test/core/end2end/tests/retry_non_retriable_status.cc

@@ -51,7 +51,7 @@ CORE_END2END_TEST(RetryTest, RetryNonRetriableStatus) {
       "  } ]\n"
       "}"));
   auto c =
-      NewClientCall("/service/method").Timeout(Duration::Seconds(5)).Create();
+      NewClientCall("/service/method").Timeout(Duration::Seconds(30)).Create();
   EXPECT_NE(c.GetPeer(), absl::nullopt);
   IncomingMessage server_message;
   IncomingMetadata server_initial_metadata;

test/core/end2end/tests/retry_throttled.cc

@@ -58,7 +58,7 @@ CORE_END2END_TEST(RetryTest, RetryThrottled) {
       "}"));
   InitClient(ChannelArgs());
   auto c =
-      NewClientCall("/service/method").Timeout(Duration::Seconds(5)).Create();
+      NewClientCall("/service/method").Timeout(Duration::Seconds(30)).Create();
   EXPECT_NE(c.GetPeer(), absl::nullopt);
   IncomingStatusOnClient server_status;
   IncomingMetadata server_initial_metadata;