Currently, if you configure a webhook with reviewable events and apply
categories/tags filtering, no webhook gets fired for reviewable events.
This is because when we schedule the `EmitWebHookEvent` job, we don't
pass to it the reviewable's category or tags, making it seem like the
reviewable doesn't belong to the filtering category/tags that webhook
specifies.
The most common thing that we do with fab! is:
fab!(:thing) { Fabricate(:thing) }
This commit adds a shorthand for this which is just simply:
fab!(:thing)
i.e. If you omit the block, then, by default, you'll get a `Fabricate`d object using the fabricator of the same name.
Currently, only user badge grants emit webhook events. This change
extends the `user_badge` webhook to emit user badge revocation events.
A new `user_badge_revoked` event has been introduced instead of relying
on the existing `user_badge_removed` event. `user_badge_removed` emitted
just the `badge_id` and `user_id` which aren't helpful for generating a
meaningful webhook payload for revoked(deleted) user badges.
The new event emits the user badge object.
