Analytics duplication refactor #200

Job	Run time
check_digit_tests	2m 18s
data_browser_tests	2m 46s
common_tests	2m 19s
hmda_platform_tests	6m 13s
hmda_analytics_tests	2m 16s
hmda_data_publisher_tests	3m 23s
hmda_quarterly_data_service_tests	2m 18s
hmda_reporting_tests	2m 32s
institutions_api_tests	2m 33s
modified_lar_tests	2m 14s
rate_limit_tests	2m 17s
ratespread_calculator_tests	2m 20s
submission_errors_tests	2m 33s
	36m 2s

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