inc984: scrub `user` from spans (#6689) #19553

Job	Run time
detect what files changed	3s
pre-commit hooks	35s
Linting - Rust	2m 16s
mypy typing	1m 8s
Dataset Config Validation	31s
Build snuba CI image	9m 28s
Publish Snuba to DockerHub	6m 47s
self-hosted-end-to-end	19m 34s
Front end tests for snuba admin	1m 10s
Tests on multiple clickhouse versions (23.8.11.29.altinitystable)	12m 15s
sentry (0)	6m 3s
Tests and code coverage (test)	12m 14s
Tests on multiple clickhouse versions (24.3.5.47.altinitystable)	12m 26s
sentry (1)	5m 31s
Tests and code coverage (test_rust)	4m 29s
Tests and code coverage (test_distributed)	20m 59s
Tests and code coverage (test_distributed_migrations)	2m 38s
sentry (2)	5m 55s
sentry (3)	5m 52s
	2h 9m 54s

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