Use Django's `LiveServerTestCase` for frontend tests #3812

Job	Run time
MyPy	1m 33s
Formatting	1m 34s
Backup process	2m 54s
Compile Scss	1m 40s
Linter	2m 8s
Build nix environment on MacOS	3m 46s
Test + Coverage	2m 45s
Test Frontend	3m 29s
Test (shuffled order)	2m 17s
	22m 6s

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