VED-747 Refactor update immunisation endpoint #325

Job	Run time
deploy-pr-backend / terraform-plan	27s
deploy-pr-backend / terraform-apply	5m 37s
run-e2e-tests (internal-dev-sandbox) / wait-for-deployment	5m 10s
run-e2e-tests (internal-dev) / wait-for-deployment	5s
run-e2e-tests (internal-dev) / e2e-tests	5m 45s
run-e2e-tests (internal-dev-sandbox) / e2e-tests	21s
run-e2e-tests (internal-dev-sandbox) / batch-e2e-tests	0s
run-e2e-tests (internal-dev) / batch-e2e-tests	1m 21s
	18m 46s

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