Add end date to Intervention model (refs #3825) #2682

Job	Run time
Build 20.04 package	3m 42s
Build docker image	6m 6s
Build 18.04 package	3m 9s
Python Unittests (bionic-3.8, 3.8, tests)	17m 13s
Python Unittests (bionic-3.8, 3.8, tests_nds)	15m 13s
Python Unittests (focal-3.8, 3.8, tests)	17m 31s
Python Unittests (focal-3.8, 3.8, tests_nds)	15m 6s
Tests E2E 20.04	6m 48s
Tests E2E docker	6m 50s
Publish (on release only)	0s
	1h 31m 38s

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