[exporter/datadog] Update HTTP configuration #42896
Merged
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Description
Use HTTPTransportFunc instead of the deprecated HTTPClientFunc.
HTTPClientFunc was initially added to add support for custom transports on the opentelemetry exporter, but since datadog Agent 7.63 we can now use HTTPTransportFunc instead.
This change will allow us to fully remove HTTPClientFunc on the agent, and further simplify the configuration options.