Use react-select in variable dropdown for better UX #13962

Job	Run time
End-to-end tests, chromium	13m 21s
Run the Django test suite	8m 7s
Run the Django test suite in reverse	5m 53s
End-to-end tests, firefox	16m 45s
Set up docker build 'dynamic' env variables	1s
End-to-end tests, webkit	12m 1s
Build and check documentation	3m 55s
docker_build (production) / Build image	2m 46s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 45s
Scan docker image	27s
Simulate upgrading instances (2.7.4)	1m 21s
Simulate upgrading instances (2.7.6)	1m 20s
Check for unexepected OAS changes	7s
Validate OAS	12s
Generate Postman collection from OAS	10s
Generate SDKs from OAS	34s
Push Docker image	0s
update-docker-readme	0s
	1h 9m 45s

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