Respect startPublishing
call by always re-notifying watcher in XdsClientImpl
#1018
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When switching from the backup to the primary store (implemented in the XdsClientImpl), the data in the primary store is never replayed. This is different from the backup store behavior which respects the invocation of startPublishing and replays the contents of the store. This means that if the contents of the backup store are different from the contents of the primary store, and the client switches from the backup to the primary, the client will only see the backup values and not the primary values.