Filter Redux event firehose for relevant events

[jhnstn]

We expect to receive more events than needed once we tap into the Gutenberg via Redux middleware.

We will need to filter those events before we forward them to the native analytics flow.

[jhnstn]

The work required for this is minimal and will be captured in #4009
Also, since we are holding on the generic event type in the host apps, there is no need to spend time on all the redux events we need to filter now. The pattern will be set for the first event and will allow for filtering additional events.