Function registerNotificationChannelIfNeeded

registerNotificationChannelIfNeeded(
subscriptionManager: ESPSubscriptionManager,
): Promise<void>
Registers the notification subscription channel with the subscription manager if not already registered.
Parameters
- subscriptionManager: ESPSubscriptionManager
  The subscription manager instance.
Returns Promise<void>
Promise that resolves when the channel is registered, or immediately if already registered.
- Defined in src/services/ESPRMHelpers/ChannelRegistration.ts:17