[#3558] Add an extra `identifier` field to account for analytics #10024

Job	Run time
Build and check documentation	2m 8s
Set up docker build 'dynamic' env variables	1s
End-to-end tests, chromium	8m 39s
Run the Django test suite	9m 48s
End-to-end tests, firefox	10m 29s
End-to-end tests, webkit	9m 0s
Run the Django test suite in reverse	7m 43s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	7m 34s
docker_build (production) / Build image	7m 33s
Check for unexepected OAS changes	0s
Generate Postman collection from OAS	0s
Validate OAS	0s
Generate SDKs from OAS	0s
Push Docker image	0s
update-docker-readme	0s
	1h 2m 55s

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