Make stress test more realistic #4184

Job	Run time
test (stable)	16m 49s
external-types (opentelemetry)	1m 40s
cargo-deny	27s
test (beta)	17m 24s
external-types (opentelemetry-sdk)	1m 20s
coverage	8m 32s
docs	5m 58s
msrv	4m 17s
lint	6m 1s
non-default-examples (opentelemetry-otlp/examples/external-otlp-grpcio-async-std)	5m 11s
non-default-examples (opentelemetry-otlp/examples/basic-otlp)	1m 31s
	1h 9m 10s

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