Improve test stability #67

Job	Run time
linux-64-py3.10	6m 24s
estimation_edb_creation_test	6m 36s
macOS	5m 31s
develop-docbuild	0s
prototype_mtc	49m 38s
win-64	11m 36s
Estimation Mode Unit Tests	25m 46s
placeholder_psrc	43m 19s
Estimation Notebooks Test	39m 51s
prototype_marin	3m 1s
Standard 1-Zone Example (MTC)	58m 58s
random_seed_generation_test	3m 49s
prototype_mtc_extended	1h 27m 27s
Standard 2-Zone Example (SANDAG)	1h 7m 36s
placeholder_sandag	1h 46m 55s
prototype_sandag_xborder	5m 41s
production_semcog	6m 35s
prototype_mwcog	50m 54s
placeholder_multiple_zone	9m 34s
	9h 49m 11s

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