Slack notifications fails to send to multiple channels

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Summary

I set up slack integration with intention to target multiple channels based on the repo activity ( notes, merge requests, etc ). I have found that the channel overrides don't seem to work and the main channel only receives the messages.

https://gitlab.zendesk.com/agent/tickets/234186

Steps to reproduce

Example Project

What is the current bug behavior?

What is the expected correct behavior?

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

• For GitLab.com, this bug is addressed with the GitLab for Slack app, which now supports configuring and managing notifications.
• For self-managed users, we'll be adding self-managed support to our GitLab for Slack app in Slack application integration for self-managed ... (&1211 - closed). This bug will remain open until that issue is closed. I can't add a blocking relationship for an epic so using a child issue (Generate Slack app Manifest File for Self-Manag... (#358872 - closed)) as the blocking issue to close this bug.