Remove unused StUF-ZDS 'gemeentecode' #11818

Job	Run time
Run the Django test suite	4m 46s
Set up docker build 'dynamic' env variables	1s
Build and check documentation	2m 22s
Run the Django test suite in reverse	4m 8s
End-to-end tests, chromium	11m 3s
End-to-end tests, firefox	14m 7s
End-to-end tests, webkit	11m 26s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	7m 3s
docker_build (production) / Build image	7m 10s
Check for unexepected OAS changes	0s
Validate OAS	0s
Generate Postman collection from OAS	0s
Generate SDKs from OAS	0s
Scan docker image	2m 10s
Push Docker image	0s
update-docker-readme	0s
	1h 4m 16s

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