otlp: Clients to close body uniformly #14880

Job	Run time
compatibility-test (1.23.0, ubuntu-latest, 386)	1m 14s
compatibility-test (1.23.0, ubuntu-latest, amd64)	1m 11s
compatibility-test (1.23.0, otel-linux-arm64, arm64)	1m 18s
lint	2m 33s
compatibility-test (1.23.0, macos-13, amd64)	2m 9s
compatibility-test (1.23.0, macos-latest, arm64)	1m 15s
compatibility-test (1.23.0, windows-latest, 386)	3m 22s
test-bench	1m 11s
compatibility-test (1.23.0, windows-latest, amd64)	3m 23s
compatibility-test (~1.22.5, ubuntu-latest, 386)	1m 8s
test-concurrent-safe	3m 58s
compatibility-test (~1.22.5, ubuntu-latest, amd64)	1m 7s
compatibility-test (~1.22.5, otel-linux-arm64, arm64)	1m 17s
compatibility-test (~1.22.5, macos-13, amd64)	2m 12s
test-coverage	1m 21s
compatibility-test (~1.22.5, macos-latest, arm64)	1m 26s
compatibility-test (~1.22.5, windows-latest, 386)	3m 14s
test-race	2m 5s
compatibility-test (~1.22.5, windows-latest, amd64)	2m 29s
codecov	7s
test-compatibility	1s
	38m 1s

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