Subscription creation shows both an ephemeral and a normal post to the channel

[DHaussermann]

When a user creates a Bitbucket subscription, a post is shown with subscription info for all channel members to see.

The issue is that the ephemeral post is also shown to the user who created the subscription. This ephemeral post is redundant and not needed.

Steps:

• Setup Bitbucket and connect a user
• Add a subscription to a channel Observed: