[#2903] Refactor import/export for ZaakType configs #8179

Job	Run time
Build and check documentation	1m 28s
End-to-end tests, chromium	4m 2s
Run the Django test suite (main)	20m 25s
End-to-end tests, firefox	4m 23s
Run the Django test suite (elastic)	5m 22s
Check that documentation for configuration steps is up-to-date	1m 26s
End-to-end tests, webkit	4m 9s
Run the Django test suite (openklant)	2m 44s
End-to-end tests, msedge	4m 3s
Build (and push) Docker image	0s
Upload coverage information to codecov	0s
	48m 2s

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