Refactor feature flags #12609

Job	Run time
Build and check documentation	3m 5s
Set up docker build 'dynamic' env variables	1s
End-to-end tests, chromium	11m 45s
End-to-end tests, firefox	14m 4s
Run the Django test suite	7m 27s
End-to-end tests, webkit	11m 0s
Run the Django test suite in reverse	5m 45s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	4m 57s
docker_build (production) / Build image	4m 58s
Scan docker image	2m 11s
Check for unexepected OAS changes	5s
Generate Postman collection from OAS	18s
Validate OAS	15s
Generate SDKs from OAS	35s
Push Docker image	0s
update-docker-readme	0s
	1h 6m 26s

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