Add end date to Intervention model (refs #3825) #2685

Job	Run time
Build docker image	6m 49s
Python Unittests (bionic-3.8, 3.8, tests)	17m 1s
Python Unittests (bionic-3.8, 3.8, tests_nds)	14m 57s
Python Unittests (focal-3.8, 3.8, tests)	16m 35s
Python Unittests (focal-3.8, 3.8, tests_nds)	14m 18s
Build 18.04 package	3m 11s
Build 20.04 package	3m 47s
Tests E2E 20.04	7m 21s
Tests E2E docker	7m 12s
Publish (on release only)	0s
	1h 31m 11s

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