🔥 Delete migration test code #14786

Job	Run time
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 48s
End-to-end tests, chromium	13m 45s
End-to-end tests, firefox	16m 42s
Run the Django test suite	8m 19s
Run the Django test suite in reverse	5m 44s
End-to-end tests, webkit	11m 58s
docker_build (production) / Build image	2m 43s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	3m 16s
Simulate upgrading instances (2.7.4)	1m 23s
Simulate upgrading instances (2.7.8)	1m 24s
Scan docker image	2m 22s
Check for unexepected OAS changes	27s
Generate SDKs from OAS	33s
Generate Postman collection from OAS	18s
Validate OAS	17s
Push Docker image	0s
update-docker-readme	0s
	1h 13m 0s

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