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Part of #5249.
Addresses #5249 (comment)
This removes handling of the
OTEL_GO_X_EXEMPLAR
environment variable.Instead of changing the default for the existing environment variable to enable it by default, i'm just removing it entirely. Users can still disable the feature by setting the filter to always_off. Since we will continue to support that configuration, it seems better to direct users there, rather than give them a temporary equivalent.