[8.4](backport #823) Fix/panic with composable renderer #894
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* Fix a panic with wg passed to the composable object In the code to retrieve the variables from the configuration files we need to pass a execution callback, this callback will be called in a goroutine. This callback can be executed multiple time until the composable renderer is stopped. There were a problem in the code that made the callback called multiple time and it made the waitgroup internal counter to do to a negative values. This commit change the behavior, it start the composable renderer give it a callback when the callback receives the variables it will stop the composable's Run method using the context. This ensure that the callback will be called a single time and that the variables are correctly retrieved. Fixes: #806 (cherry picked from commit 56787a6)
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