chore(flowController): remove unused isDone() #6502

Job	Run time
get-content-file	4s
code-quality / npm run format	26s
code-quality / npm run lint	1m 5s
code-quality / npm run typecheck	35s
code-quality / npm run test:coverage	3m 2s
verify-local-e2e / e2e-tests (1)	1m 56s
verify-local-e2e / e2e-tests (2)	1m 32s
verify-local-e2e / e2e-tests (3)	1m 49s
verify-local-e2e / e2e-tests (4)	1m 13s
verify-local-e2e / merge-reports	0s
build-push-app-image	3m 45s
deploy-staging	1m 48s
deploy-preview	1m 35s
verify-preview-e2e / e2e-tests (1)	3m 27s
verify-preview-e2e / e2e-tests (2)	1m 25s
verify-preview-e2e / e2e-tests (3)	3m 9s
verify-preview-e2e / e2e-tests (4)	2m 6s
verify-preview-e2e / merge-reports	0s
deploy-production	1m 59s
test-production-text	3s
Send failure message to Slack	0s
	30m 59s

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