ONPREM-448: Adjust LiveEntry::getStreamName() to use a switch statement based on the value of $liveBackend

[navarro967]

This pull request adjusts the LiveEntry::getStreamName() method to use a switch statement based on the value of the $liveBackend variable. This allows for different behavior depending on the value of $liveBackend, specifically for the LIVE_BACKEND_WOWZA and LIVE_BACKEND_LIVE_NG cases. This change improves the flexibility and maintainability of the code.