Refactor validation plugins #10488

Job	Run time
Set up docker build 'dynamic' env variables	1s
Build and check documentation	1m 56s
Run the Django test suite	11m 15s
End-to-end tests, chromium	9m 32s
Run the Django test suite in reverse	8m 4s
End-to-end tests, firefox	11m 35s
End-to-end tests, webkit	9m 37s
docker_build (production) / Build image	8m 41s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	8m 38s
Scan docker image	2m 15s
Check for unexepected OAS changes	7s
Generate Postman collection from OAS	10s
Validate OAS	15s
Generate SDKs from OAS	33s
Push Docker image	0s
update-docker-readme	0s
	1h 12m 39s

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