exporter/datadogexporter: allow more trace-agents

[gbbr]

This change ensures that each receiver instantiated by the factory uses its own pkg/trace/agent instance to facilitate multiple API endpoints.

[runforesight]

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Major Impacts

build-and-test-windows duration(5 seconds) has decreased 40 minutes 31 seconds compared to main branch avg(40 minutes 36 seconds).

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⭕  build-and-test-windows workflow has finished in 5 seconds (40 minutes 39 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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windows-unittest	-     🔗	N/A	See Details

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✅  check-links workflow has finished in 44 seconds (1 minute 9 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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✅  telemetrygen workflow has finished in 49 seconds (1 minute 40 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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✅  changelog workflow has finished in 2 minutes 22 seconds and finished at 3rd Feb, 2023.

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✅  build-and-test workflow has finished in 39 minutes 54 seconds (13 minutes 4 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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Job	Failed Steps	Tests
unittest-matrix (1.18, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	-     🔗	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, processor)	-     🔗	✅ 1471  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	-     🔗	✅ 1471  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, extension)	-     🔗	✅ 546  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	-     🔗	✅ 546  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	-     🔗	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-0)	-     🔗	✅ 2578  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-0)	-     🔗	✅ 2578  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	-     🔗	✅ 2438  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, exporter)	-     🔗	✅ 2438  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-1)	-     🔗	✅ 1951  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1951  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, other)	-     🔗	✅ 4663  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	-     🔗	✅ 55  ❌ 0  ⏭ 0    🔗	See Details
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publish-dev	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

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✅  prometheus-compliance-tests workflow has finished in 3 minutes 33 seconds (4 minutes 10 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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Job	Failed Steps	Tests
prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  load-tests workflow has finished in 7 minutes 42 seconds (6 minutes 53 seconds less than main branch avg.) and finished at 3rd Feb, 2023.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 19  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	N/A	See Details

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[songy23]

One nit comment, looks good otherwise