Improve syncing/refresh performance of watch app

Syncing the watch app can be very slow with large accounts.

We might just need to use the [horologist network awareness](https://google.github.io/horologist/network-awareness/) library to prefer wifi when it is available [like we do for downloads](https://github.com/Automattic/pocket-casts-android/pull/881).

Start by reading the Horologist network awareness documentation and the linked pull request for the existing download behavior. Then locate the watch-app sync and refresh entry points; done means syncing uses the intended available network preference and performance is improved for large accounts.

Written by the indexing model from the issue text.