* Add recommended JVM args to the Gradle module for HZ performance
* Move `IdempotentReceiverIntegrationTests` from JMX module to HZ for consistency
* Remove component scan from the `HazelcastIntegrationOutboundTestConfiguration` - redundant
* Use `HazelcastInstance.shutdown()` during normal context lifecycle.
The `@AfterClass` may happen early, so the `stop()` of the channel adapters may fail with
an exception that HZ is not available causing the `LifecycleProcessor` to wait for 30 seconds
on the lifecycle barrier
* Wrap `AbstractEndpoint.doStop()` call into `try..catch` to log error instead of re-throwing
to avoid the mentioned above 30 secs delay of the application context stop
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