[#5074] Transform data for `selectboxes` in the registrations (variables tab) #15647

Job	Run time
Run the Django test suite in reverse	5m 33s
Run the Django test suite	7m 23s
Build and check documentation	1m 30s
End-to-end tests, firefox	16m 48s
Set up docker build 'dynamic' env variables	2s
End-to-end tests, webkit	14m 13s
End-to-end tests, chromium	14m 13s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 56s
docker_build (production) / Build image	2m 52s
Simulate upgrading instances (3.0.1)	1m 41s
Scan docker image	2m 53s
Check for unexepected OAS changes	7s
Validate OAS	13s
Generate Postman collection from OAS	10s
Generate SDKs from OAS	33s
Push Docker image	0s
update-docker-readme	0s
	1h 11m 7s

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