Improve test stability #68

Job	Run time
linux-64-py3.10	6m 20s
estimation_edb_creation_test	6m 27s
prototype_mtc	49m 48s
develop-docbuild	0s
placeholder_psrc	43m 31s
Estimation Mode Unit Tests	25m 55s
prototype_marin	3m 8s
Estimation Notebooks Test	41m 18s
prototype_mtc_extended	1h 29m 45s
macOS	6m 37s
placeholder_sandag	1h 45m 29s
Standard 1-Zone Example (MTC)	53m 6s
win-64	12m 0s
prototype_sandag_xborder	5m 54s
random_seed_generation_test	3m 50s
Standard 2-Zone Example (SANDAG)	1h 10m 35s
production_semcog	6m 51s
prototype_mwcog	51m 2s
placeholder_multiple_zone	9m 34s
	9h 51m 10s

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