Analytics duplication refactor #18

Job	Run time
check_digit_tests	2m 23s
common_tests	2m 23s
data_browser_tests	2m 40s
hmda_analytics_tests	2m 40s
hmda_data_publisher_tests	3m 30s
hmda_platform_tests	5m 42s
hmda_quarterly_data_service_tests	2m 21s
hmda_reporting_tests	2m 32s
modified_lar_tests	2m 16s
rate_limit_tests	2m 16s
institutions_api_tests	2m 30s
ratespread_calculator_tests	2m 19s
submission_errors_tests	2m 21s
	35m 53s

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