Fix pool creation by removing interest rate from junior (residual) tranche #1454

Job	Run time
check_app_bucket	7m 23s
check_pinning	3m 23s
check_onboarding	3m 27s
cleanup-pr	0s
pinning-pr-deploy / build-pinning-api	1m 1s
onboarding-pr-deploy / build-onboarding-api	1m 5s
pinning-pr-deploy / deploy-pinning-api	1m 22s
onboarding-pr-deploy / deploy-onboarding-api	1m 33s
app-pr-deploy	0s
	19m 14s

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