feat: make spans fit an envelope size #6531

Job	Run time
Agent unit tests	1m 13s
CLI unit tests	29s
Build docker image	5m 38s
config-e2e	1s
API Server unit tests	2m 41s
WebUI unit tests	1m 53s
CLI smoke tests (local)	44s
Test examples (collector)	40s
CLI smoke tests (docker)	43s
Test examples (tracetest-jaeger)	43s
CLI e2e tests (8, 0)	1m 24s
WebUI End-to-end tests (1)	2m 36s
Test examples (tracetest-opensearch)	7m 26s
CLI e2e tests (8, 1)	1m 35s
WebUI End-to-end tests (2)	2m 36s
Test examples (tracetest-tempo)	43s
Tracetesting API Server (InMemory)	3m 52s
CLI e2e tests (8, 2)	1m 19s
WebUI End-to-end tests (3)	2m 29s
Test examples (tracetest-provisioning-env)	43s
CLI e2e tests (8, 3)	1m 28s
CLI e2e tests (8, 4)	1m 21s
WebUI End-to-end tests (4)	2m 34s
CLI e2e tests (8, 5)	2m 40s
Tracetesting API Server (NATS)	3m 49s
WebUI End-to-end tests (5)	2m 33s
CLI e2e tests (8, 6)	1m 30s
WebUI End-to-end tests (6)	3m 36s
CLI e2e tests (8, 7)	3m 35s
WebUI End-to-end tests (7)	2m 35s
WebUI End-to-end tests (8)	2m 27s
	1h 7m 36s

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