Use Django's `LiveServerTestCase` for frontend tests #3804

Job	Run time
Test + Coverage	2m 48s
Compile Scss	1m 29s
Backup process	3m 11s
Formatting	1m 31s
Linter	2m 11s
MyPy	1m 33s
Test Frontend	3m 2s
Test (shuffled order)	2m 33s
Build nix environment on MacOS	3m 57s
	22m 15s

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