Log the podcast_shared event after the user actually shares the item

[bjtitus]

Description

We currently log podcast_shared when the user selects an item type to share but before they actually share the item. We might want to only log this when the user actually shares the item. Additionally, this event logs a action property which indicates what type of sharing occurred. We could log a similar property with the UIActivity.ActivityType to indicate some common ones such as links or messages.

Step-by-step reproduction instructions

Enable the tracksLogging feature flag

1. Navigate to an Episode Detail page
2. Tap the Share button in the upper right
3. Select an option to share
4. Notice that the podcast_shared event is logged

Screenshots or screen recording

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Device, Operating system, and Pocket Casts app version

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