Update ff rollout template and docs
What does this MR do and why?
Relates to #345486 (closed)
Updates feature flag rollout template and control.md#communicate-the-change
docs to mention notifying the support_gitlab-com
slack channel when doing production rollouts.
Screenshots or screen recordings
These are strongly recommended to assist reviewers and reduce the time to merge your change.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Rajendra Kadam