Add subaccount usernames table to list of tables to export. (backport… #1730

Job	Run time
(Public Testnet) Build and Push ECS Services / call-build-and-push-ecs-service-comlink / (comlink) Build and Push	4m 22s
(Public Testnet) Build and Push ECS Services / call-build-and-push-ecs-service-ender / (ender) Build and Push	4m 6s
(Public Testnet) Build and Push ECS Services / call-build-and-push-ecs-service-socks / (socks) Build and Push	4m 7s
(Public Testnet) Build and Push ECS Services / call-build-and-push-bazooka-lambda / (bazooka) Build and Push Lambda	5m 27s
(Public Testnet) Build and Push ECS Services / call-build-and-push-ecs-service-roundtable / (roundtable) Build and Push	4m 12s
(Public Testnet) Build and Push ECS Services / call-build-and-push-auxo-lambda / (auxo) Build and Push Lambda	5m 19s
(Public Testnet) Build and Push ECS Services / call-build-and-push-vulcan / (vulcan) Build and Push	4m 4s
	31m 37s

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