Get mean of actual values (do not imply missing == 0) in Streetscape #2594

Job	Run time
ubuntu-latest, ci/envs/310-oldest.yaml	3m 30s
ubuntu-latest, ci/envs/310-latest.yaml	3m 19s
ubuntu-latest, ci/envs/311-latest.yaml	3m 45s
ubuntu-latest, ci/envs/312-latest.yaml	4m 20s
ubuntu-latest, ci/envs/312-dev.yaml	5m 18s
macos-13, ci/envs/312-latest.yaml	6m 31s
macos-14, ci/envs/312-latest.yaml	3m 12s
windows-latest, ci/envs/312-latest.yaml	10m 38s
ubuntu-latest, ci/envs/312-min.yaml	2m 57s
	43m 30s

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