ContextDataFetcherDecorator should capture from global and local GraphQLContext

[bclozel]

Currently, the ContextDataFetcherDecorator captures context values from the global GraphQLContext and set captured values in the execution context of the decorated DataFetcher. Each DataFetcher can also contribute additional context values by returning a DataFetcherResult containing a localContext that will be used when calling other DataFetcher lower in the hierarchy call.

We should ensure that ContextDataFetcherDecorator captures from both global and local GraphQLContext, if the latter is present. This requires a change in the context-propagation library, see micrometer-metrics/context-propagation#98.

[bclozel]

A temporary fix has been applied in #676 in the ContextDataFetcherDecorator - we should roll this back once micrometer-metrics/context-propagation#98 is done.