Display where the env was loaded from when enabled `typedEnv` (#70951)
### Why?
This PR added an indication of where the env was loaded from when
`experimental.typedEnv` was enabled. Also, it allows the user to set
`NODE_ENV=production` to enable the `typedEnv` feature for
`.env.production*` files.

### How?
Modified `@next/env` to pass parsed envs along with the `loadedEnvFiles`
value and used the location to indicate via JSDoc.