ref(tracing): Use float for sample rand #4004

Job	Run time
Cloud (pinned) (3.10, ubuntu-22.04)	1m 49s
Cloud (pinned) (3.7, ubuntu-22.04)	4m 8s
Cloud (pinned) (3.9, ubuntu-22.04)	4m 52s
Cloud (pinned) (3.8, ubuntu-22.04)	4m 59s
Cloud (pinned) (3.12, ubuntu-22.04)	2m 41s
Cloud (pinned) (3.11, ubuntu-22.04)	3m 37s
Cloud (pinned) (3.6, ubuntu-22.04)	2m 33s
Cloud (pinned) (3.13, ubuntu-22.04)	6m 1s
All pinned Cloud tests passed	4s
	30m 44s

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