[exporter/signalfx] Prioritize token from context in exporter #37276
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Description
In preparation for deprecating access_token_passthrough from the signalfx receiver and exporter, update the signalfx exporter to taken accessToken from the context
Testing
Updated unit tests
tested end to end with the following setup
telemetrygen sending metrics in otlp over grpc with X-Sf-Token header and token
otlp receiver with include_metadata set to true
batch processor using the X-Sf-Token key to group
access_token_passthrough set to true