Support disabling auto-updates for travel integrations

Since Google Travel time and Waze moved to UI setup the sensors auto-update every 5 minutes, and that’s costing people money.

During the 2021.5 beta process it had been discussed to provide a feature like this, but clearly that didn’t happen.

This is a request to add that feature in, or at least allow the UI integrations to support something similar to the scan_interval that the YAML integrations supported.