Tracing doesn't work with UDS

[zhaohuabing]

Description:

When deploying datadog agent as a sidecar and using UDS for communication between the datadog agent and envoy proxy, this error is reported by Envoy:

[2025-06-13 01:25:24.945][13][error][tracing] [source/extensions/tracers/datadog/logger.cc:37] Datadog [error 44]: Unexpected error submitting telemetry event: Failed to create request.

The reason is that STRICT_DNS is used for UDS endpoint:

[arkodg]

gateway/internal/xds/translator/tracing.go

Line 135 in e78e268

endpointType: EndpointTypeDNS,

needs to be read from the IR