VED-835 Refactor create immunisation endpoint #159

Job	Run time
deploy-pr-backend / terraform-plan	47s
deploy-pr-backend / terraform-apply	4m 57s
run-e2e-tests (internal-dev) / wait-for-deployment	4s
run-e2e-tests (internal-dev-sandbox) / wait-for-deployment	2m 7s
run-e2e-tests (internal-dev) / e2e-tests	7m 4s
run-e2e-tests (internal-dev-sandbox) / e2e-tests	26s
run-e2e-tests (internal-dev-sandbox) / batch-e2e-tests	-1s
run-e2e-tests (internal-dev) / batch-e2e-tests	1m 17s
	16m 41s

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