iox-eclipse-iceoryx#337 Adapt mepoo integration test

Use std::chrono::steady_clock instead of PosixTimer

Signed-off-by: Marika Lehmann <marika.lehmann@apex.ai>

iceoryx_posh/test/integrationtests/test_posh_mepoo.cpp

@@ -449,18 +449,18 @@ TIMING_TEST_F(Mepoo_IntegrationTest, MempoolCreationTimeDefaultConfig, Repeat(5)
     MemPoolInfoContainer memPoolTestContainer;
     auto testMempoolConfig = defaultMemPoolConfig();
 
-    auto start = Timer::now();
+    auto start = std::chrono::steady_clock::now();
 
     SetUp(memPoolTestContainer, testMempoolConfig, configType::DEFAULT);
 
-    auto stop = Timer::now();
+    auto stop = std::chrono::steady_clock::now();
 
     // Calc the difference
-    iox::units::Duration timediff = stop.value() - start.value();
+    auto timediff = iox::units::Duration(stop - start);
 
     PrintTiming(timediff);
 
-    /// Currently we expect that the RouDi is ready at least after 2 seconds
+    // Currently we expect that the RouDi is ready at least after 2 seconds
     auto maxtime = 2000_ms;
     EXPECT_THAT(timediff, Le(maxtime));
 });