Replace digid_eherkenning_oidc_generics with library code #7214

Job	Run time
Build and check documentation	1m 43s
End-to-end tests, chromium	4m 11s
Run the Django test suite (main)	19m 25s
End-to-end tests, firefox	4m 21s
Run the Django test suite (elastic)	5m 41s
End-to-end tests, webkit	4m 14s
End-to-end tests, msedge	4m 35s
Upload coverage information to codecov	30s
Build (and push) Docker image	1m 50s
	46m 30s

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