[#5074] Transform data for `selectboxes` in the registrations (variables tab) #15670

Job	Run time
End-to-end tests, webkit	14m 45s
Run the Django test suite	6m 54s
Build and check documentation	2m 24s
End-to-end tests, firefox	18m 32s
Set up docker build 'dynamic' env variables	4s
Run the Django test suite in reverse	5m 44s
End-to-end tests, chromium	14m 11s
docker_build (production) / Build image	2m 44s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 49s
Scan docker image	2m 35s
Simulate upgrading instances (3.0.1)	1m 21s
Generate Postman collection from OAS	0s
Check for unexepected OAS changes	0s
Generate SDKs from OAS	0s
Validate OAS	-1s
Push Docker image	0s
update-docker-readme	0s
	1h 12m 2s

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