VED-802 Refactor delta_backend #126

Job	Run time
deploy-pr-backend / terraform-plan	44s
deploy-pr-backend / terraform-apply	2m 1s
run-e2e-tests (internal-dev) / wait-for-deployment	36s
run-e2e-tests (internal-dev-sandbox) / wait-for-deployment	3m 39s
run-e2e-tests (internal-dev) / e2e-tests	6m 18s
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 29s
	15m 6s

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