Use Django's `LiveServerTestCase` for frontend tests #3800

Job	Run time
Test Frontend	3m 17s
Formatting	1m 41s
Linter	2m 13s
MyPy	1m 44s
Test + Coverage	2m 48s
Test (shuffled order)	2m 30s
Backup process	3m 5s
Compile Scss	1m 37s
Build nix environment on MacOS	3m 14s
	22m 9s

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