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Closes #504

Summary

On production right now, if you reject a post in a group you moderate, the post no longer appears in the queue, but still shows up in the feed for mods only like so:

Testing

1. Make a group, make it moderated.
2. Login to a secondary account, create posts numbered 1, 2, 3, 4, 5.
3. Log-in to primary account, look at the group, see the posts with "awaiting moderation"
4. Go to the moderation queue and reject the post numbered 3.
5. Check that the activity with the content '3' is not visible on the feed with its "awaiting moderation"

added MR::Awaiting Review Squad::Yellow scoped labels