VED-802 Refactor delta_backend #143

Job	Run time
deploy-pr-backend / terraform-plan	39s
deploy-pr-backend / terraform-apply	2m 37s
run-e2e-tests (internal-dev-sandbox) / wait-for-deployment	3m 10s
run-e2e-tests (internal-dev) / wait-for-deployment	3s
run-e2e-tests (internal-dev) / e2e-tests	7m 0s
run-e2e-tests (internal-dev-sandbox) / e2e-tests	32s
run-e2e-tests (internal-dev-sandbox) / batch-e2e-tests	0s
run-e2e-tests (internal-dev) / batch-e2e-tests	1m 25s
	15m 26s

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