Slack notifications filter angle and square brackets from commit messages

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We have set up Slack notifications according to https://docs.gitlab.com/ee/user/project/integrations/slack.html, but there is something wrong with them. When a commit message contains angle brackets, they are not displayed in the Slack message. Examples:

• Original commit message: "#343 Rename `clientI{D => d}`"
  
• Original commit message: "#287 Allow editing label options in <ReorderList>"
  

The angle brackets should probably be converted into </> or escaped in some other way.