Update Discord notifications integration to use sections
What does this MR do and why?
Add sections definition for Discord notifications integration.
Screenshots or screen recordings
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How to set up and validate locally
- Go to Project > Settings > Integrations > Discord notifications. For example,
http://127.0.0.1:3000/gitlab-org/gitlab-shell/-/settings/integrations/discord/edit.
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.
Related to #365627 (closed)

