fix(ddtrace/tracer): refactor DogStatsD URL resolution using agent-re… #1397

Job	Run time
unit-integration-tests (1.22) / copyright	10s
unit-integration-tests (1.22) / lint	1m 46s
unit-integration-tests (1.22) / test-contrib	5m 43s
unit-integration-tests (1.22) / test-core	7m 57s
unit-integration-tests (1.23) / copyright	10s
unit-integration-tests (1.23) / lint	1m 23s
unit-integration-tests (1.23) / test-contrib	6m 15s
unit-integration-tests (1.23) / test-core	8m 29s
multios-unit-tests (macos-latest, 1.22) / test-multi-os	11m 58s
multios-unit-tests (ubuntu-latest, 1.22) / test-multi-os	7m 4s
multios-unit-tests (macos-latest, 1.23) / test-multi-os	12m 14s
multios-unit-tests (ubuntu-latest, 1.23) / test-multi-os	11m 37s
multios-unit-tests (windows-latest, 1.22) / test-multi-os	17m 43s
multios-unit-tests (windows-latest, 1.23) / test-multi-os	18m 19s
	1h 50m 48s

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