fix(datadogreceiver): set AppVersion on payload so it propagates correctly #30225
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Description:
This PR sets the AppVersion property for the default fallthrough case if it exists on any spans in the request. This allows it to properly propagate through to Datadog. Currently, if using a library such as datadog/dd-trace-dotnet , the datadog service version property (dd_version) does not propagate through to datadog at all.
The bug that this fixes is that the Datadog version resource attribute is currently not flowing through.
Link to tracking Issue:
Closes #30526
Testing:
Local testing using delve to confirm expected behavior, added existing version tag to tests. Deployed patch internally on OpenTelemetry collector and observed desired behavior.
Documentation: