VED-835 Refactor create immunisation endpoint #116

Job	Run time
deploy-pr-backend / terraform-plan	35s
deploy-pr-backend / terraform-apply	2m 59s
run-e2e-tests (internal-dev-sandbox) / wait-for-deployment	5m 11s
run-e2e-tests (internal-dev) / wait-for-deployment	1m 39s
run-e2e-tests (internal-dev) / e2e-tests	6m 52s
run-e2e-tests (internal-dev-sandbox) / e2e-tests	21s
run-e2e-tests (internal-dev-sandbox) / batch-e2e-tests	-1s
run-e2e-tests (internal-dev) / batch-e2e-tests	1m 23s
	18m 59s

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