[#4853] Fixed non required fields in registration backends serializers #14852

Job	Run time
Build and check documentation	4m 24s
End-to-end tests, chromium	12m 53s
Set up docker build 'dynamic' env variables	1s
End-to-end tests, firefox	15m 57s
End-to-end tests, webkit	12m 2s
Run the Django test suite in reverse	5m 31s
Run the Django test suite	7m 56s
docker_build (production) / Build image	2m 55s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 58s
Scan docker image	2m 27s
Simulate upgrading instances (2.7.4)	1m 16s
Simulate upgrading instances (2.7.8)	1m 17s
Check for unexepected OAS changes	6s
Generate SDKs from OAS	33s
Generate Postman collection from OAS	10s
Validate OAS	23s
Push Docker image (production)	50s
Push Docker image (extensions, all-extensions-)	50s
update-docker-readme / Generate and update Docker Hub description	11s
	1h 12m 40s

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