[FEAT] Add UUIDs of parent and children Courses and Sites in APIv2 (refs #3569) #2738

Job	Run time
Build docker image	3m 43s
Build 18.04 package	3m 40s
Build 20.04 package	3m 55s
Python Unittests (bionic-3.8, 3.8, tests)	3m 42s
Python Unittests (bionic-3.8, 3.8, tests_nds)	3m 40s
Python Unittests (focal-3.8, 3.8, tests)	3m 41s
Python Unittests (focal-3.8, 3.8, tests_nds)	3m 43s
Tests E2E docker	1s
Tests E2E 20.04	1s
Publish (on release only)	1s
	26m 7s

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