UX improvements: modal registration forms for email and stuf #14298

Job	Run time
End-to-end tests, chromium	13m 46s
Run the Django test suite	7m 40s
End-to-end tests, firefox	16m 44s
End-to-end tests, webkit	12m 50s
Run the Django test suite in reverse	5m 17s
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 27s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 50s
docker_build (production) / Build image	2m 49s
Simulate upgrading instances (2.7.4)	2m 7s
Simulate upgrading instances (2.7.8)	1m 26s
Scan docker image	2m 27s
Check for unexepected OAS changes	4s
Generate SDKs from OAS	45s
Validate OAS	14s
Generate Postman collection from OAS	9s
Push Docker image	0s
update-docker-readme	0s
	1h 12m 36s

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