[connector/datadog] Use the native OTel ingest API in APM stats (#33297) #1

Job	Run time
arm-unittest-matrix (receiver-0)	1s
arm-unittest-matrix (receiver-1)	1s
arm-unittest-matrix (receiver-2)	1s
arm-unittest-matrix (receiver-3)	1s
arm-unittest-matrix (processor-0)	1s
arm-unittest-matrix (processor-1)	1s
arm-unittest-matrix (exporter-0)	1s
arm-unittest-matrix (exporter-1)	1s
arm-unittest-matrix (exporter-2)	1s
arm-unittest-matrix (exporter-3)	1s
arm-unittest-matrix (extension)	1s
arm-unittest-matrix (connector)	1s
arm-unittest-matrix (internal)	1s
arm-unittest-matrix (pkg)	1s
arm-unittest-matrix (cmd-0)	1s
arm-unittest-matrix (cmd-1)	1s
arm-unittest-matrix (other)	1s
arm-unittest	0s
	17s

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