Rework OpenID Connect integration #12772

Job	Run time
Build and check documentation	2m 38s
Run the Django test suite in reverse	5m 56s
Run the Django test suite	7m 21s
End-to-end tests, chromium	11m 59s
End-to-end tests, firefox	14m 55s
Set up docker build 'dynamic' env variables	1s
End-to-end tests, webkit	11m 45s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	4m 43s
docker_build (production) / Build image	4m 42s
Scan docker image	2m 11s
Check for unexepected OAS changes	5s
Validate OAS	12s
Generate SDKs from OAS	33s
Generate Postman collection from OAS	12s
Push Docker image	0s
update-docker-readme	0s
	1h 7m 13s

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