Add possibility to enable multi-selection in SelectWithoutFormik #15202

Job	Run time
Run the Django test suite	8m 5s
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 19s
End-to-end tests, chromium	14m 25s
End-to-end tests, firefox	17m 53s
Run the Django test suite in reverse	5m 23s
End-to-end tests, webkit	13m 32s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 42s
docker_build (production) / Build image	2m 46s
Simulate upgrading instances (3.0.1)	1m 24s
Scan docker image	2m 40s
Check for unexepected OAS changes	4s
Generate SDKs from OAS	32s
Validate OAS	17s
Generate Postman collection from OAS	9s
Push Docker image	0s
update-docker-readme	0s
	1h 13m 12s

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