remove useCurrency export

Signed-off-by: Ryan Vazquez <ryanv@spotify.com>

plugins/cost-insights/src/index.ts

@@ -25,6 +25,5 @@ export { ProjectGrowthAlert, UnlabeledDataflowAlert } from './alerts';
 export { ExampleCostInsightsClient } from './example';
 export * from './api';
 export * from './components';
-export { useCurrency } from './hooks';
 export * from './types';
 export * from './utils/tests';