VED-747 Refactor update immunisation endpoint #340

Job	Run time
deploy-pr-backend / terraform-plan	38s
deploy-pr-backend / terraform-apply	2m 57s
run-e2e-tests (internal-dev) / wait-for-deployment	35s
run-e2e-tests (internal-dev-sandbox) / wait-for-deployment	3m 38s
run-e2e-tests (internal-dev) / e2e-tests	5m 56s
run-e2e-tests (internal-dev-sandbox) / e2e-tests	19s
run-e2e-tests (internal-dev-sandbox) / batch-e2e-tests	0s
run-e2e-tests (internal-dev) / batch-e2e-tests	1m 20s
	15m 23s

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