[Client] - Adjust UsePlanData to Relace 'PlanName' with 'Value'

[adrian-codecov]

The newest plan hook, usePlanData, has a resolver exposed as planName. We traditionally have treated plan names with the key value instead, and we haven't fully offloaded of it. We're sort of introducing two values, planName and value that represent the same thing, which is hard to keep track of on the frontend. This also stems from most of the backend (excluding gql) only using value instead of planName.

This ticket is to replace every planName with value and adjust the usePlanData hook only to use value (supported on GQL in prod as of now) and get rid of planName until we revise the naming conventions again.