Analytics duplication refactor #15

Job	Run time
common_tests	2m 22s
check_digit_tests	2m 20s
data_browser_tests	2m 42s
hmda_analytics_tests	2m 36s
hmda_data_publisher_tests	3m 22s
hmda_quarterly_data_service_tests	2m 15s
hmda_platform_tests	5m 39s
hmda_reporting_tests	2m 30s
institutions_api_tests	2m 21s
rate_limit_tests	2m 12s
modified_lar_tests	2m 14s
ratespread_calculator_tests	2m 15s
submission_errors_tests	2m 22s
	35m 10s

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