* Fix new Sonar smells
* Fix some old Sonar smells as well
* Fix Micrometer leaks in the `PollableChannel` when we register
meters, but don't remove them.
* * Fix NPE around `MetricsCaptor` in channels
* * Fix new smells according test report
* * Further Sonar smell fixes
* * More smell fixes for `MessagingMethodInvokerHelper`
* Remove `throws Exception` from `AbstractMessageHandler.destroy()`
* * Fix complexity in the `MessagingMethodInvokerHelper.processInvokeExceptionAndFallbackToExpressionIfAny()`
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