build: make initial_feature_count migration idempotent #747

Job	Run time
frontend-tests / Run Frontend Tests	30s
pytest / check-img-cache	2s
pytest / test-img-build / build-image	2m 51s
frontend-build / build-image	1m 38s
frontend-build / scan-image	19s
smoke-test-frontend	52s
pytest / test-img-build / scan-image	0s
pytest / run-tests	2m 50s
backend-build / build-image	2m 20s
backend-build / scan-image	46s
smoke-test-backend	1m 23s
deploy-containers / remote-deploy	1m 31s
	15m 2s

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