feat(backend): API to delete user account #1661 (#1848) #1349

Job	Run time
backend-test / check-img-cache	2s
frontend-e2e-test / check-img-cache	0s
frontend-unit-test / Run Frontend Tests	26s
frontend-e2e-test / test-img-build	0s
frontend-e2e-test / run-tests	6m 3s
backend-test / test-img-build / build-image	2m 34s
backend-test / test-img-build / scan-image	0s
backend-test / run-tests	3m 12s
backend-build / build-image	2m 6s
frontend-build	0s
smoke-test-frontend	0s
backend-build / scan-image	42s
smoke-test-backend	1m 10s
deploy-containers	0s
	16m 15s

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