feat: make spans fit an envelope size #6532

Job	Run time
CLI unit tests	34s
Agent unit tests	1m 7s
API Server unit tests	2m 33s
WebUI unit tests	1m 59s
Build docker image	5m 50s
config-e2e	1s
Test examples (collector)	39s
CLI e2e tests (8, 0)	2m 0s
CLI smoke tests (local)	43s
Test examples (tracetest-jaeger)	53s
WebUI End-to-end tests (1)	2m 30s
CLI e2e tests (8, 1)	1m 29s
CLI smoke tests (docker)	39s
Test examples (tracetest-opensearch)	7m 24s
WebUI End-to-end tests (2)	3m 34s
CLI e2e tests (8, 2)	1m 33s
Test examples (tracetest-tempo)	43s
WebUI End-to-end tests (3)	2m 27s
CLI e2e tests (8, 3)	1m 17s
Test examples (tracetest-provisioning-env)	38s
WebUI End-to-end tests (4)	2m 32s
Tracetesting API Server (InMemory)	3m 47s
CLI e2e tests (8, 4)	1m 30s
WebUI End-to-end tests (5)	2m 24s
CLI e2e tests (8, 5)	2m 32s
WebUI End-to-end tests (6)	2m 36s
Tracetesting API Server (NATS)	3m 47s
CLI e2e tests (8, 6)	1m 23s
WebUI End-to-end tests (7)	2m 31s
CLI e2e tests (8, 7)	3m 36s
WebUI End-to-end tests (8)	2m 25s
	1h 7m 36s

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