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

Before After
Discord_notifications_before Discord_notifications_after

How to set up and validate locally

  1. 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.

Related to #365627 (closed)

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