Feature/5074 transform selectboxes data #15421

Job	Run time
Run the Django test suite	7m 33s
Run the Django test suite in reverse	7m 8s
Set up docker build 'dynamic' env variables	1s
Build and check documentation	1m 3s
End-to-end tests, chromium	15m 3s
End-to-end tests, firefox	18m 40s
End-to-end tests, webkit	15m 28s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 45s
docker_build (production) / Build image	2m 54s
Scan docker image	2m 38s
Simulate upgrading instances (3.0.1)	1m 22s
Check for unexepected OAS changes	0s
Generate SDKs from OAS	0s
Generate Postman collection from OAS	0s
Validate OAS	0s
Push Docker image	0s
update-docker-readme	0s
	1h 14m 35s

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