De-duplicate instances of components per app in comp-usage script

[Andrew565]

Currently and by way of example, if a component appears in an app and that app's sub-app, such as applications/mhv and applications/mhv/secure-messaging, it gets counted twice by the component-usage script; once for each app. This ticket seeks to resolve this by improving the way component instances get counted so that they will appear only once, for the sub-app.

For example, a VaRadioOption react-binding component that shows up in applications/mhv/secure-messaging will count as an instance for that app, but will not count as an instance for the applications/mhv app.

Details

The component-usage script is comprised of two files within the component-library/packages/design-system-dashboard-cli/src directory: create-spreadsheets.js and find-ds-components.js. This ticket will require updating the counting mechanism within create-spreadsheets.js only.

Acceptance Criteria

• [ ] The component-usage script counts each instance of a component only once, for the deepest-nested app within a given folder structure

[caw310]

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