fix(inputs.cloudwatch): Handle metric includes/excludes correctly to prevent panic #16812
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Summary
This change ensures safe handling when only one of StatisticInclude or StatisticExclude is non-nil, preventing a nil pointer dereference that was causing a panic.
Background
The bug stemmed from not accounting for all possible nil combinations of these two pointers. The existing if condition only handled the case where both were nil, but the else block did not properly handle scenarios where only one was set. This fix explicitly checks each pointer before dereferencing.
Checklist
Related issues
resolves #16779