Add/update documentation for product prefill #14869

Job	Run time
Build and check documentation	4m 24s
End-to-end tests, chromium	13m 27s
End-to-end tests, firefox	16m 9s
End-to-end tests, webkit	12m 26s
Run the Django test suite	8m 17s
Run the Django test suite in reverse	5m 40s
Set up docker build 'dynamic' env variables	1s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 49s
docker_build (production) / Build image	2m 47s
Scan docker image	2m 12s
Simulate upgrading instances (2.7.4)	1m 32s
Simulate upgrading instances (2.7.8)	1m 28s
Check for unexepected OAS changes	4s
Generate SDKs from OAS	31s
Validate OAS	14s
Generate Postman collection from OAS	11s
Push Docker image	0s
update-docker-readme	0s
	1h 12m 12s

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