Link unfurls
There is a large number of GitLab links being shared on many Slack workspaces everyday and this number is increasing year over year.
We should update our link previews to provide greater context while making them more actionable.
Related issues:
- [Slack notifications, slash commands, and unfurled links should show same content when displaying issue](https://gitlab.com/gitlab-org/gitlab/-/issues/18084)
- [Improve Slack preview/url render to display issue comment content when comment url](https://gitlab.com/gitlab-org/gitlab/-/issues/15759)
- [Unfurl links to code in Slack](https://gitlab.com/gitlab-org/gitlab/-/issues/215143)
#### Define plan for self-managed instances
Leverage [Slack's app manifest functionality](https://api.slack.com/reference/manifests) to make it easy for self-managed instance owners to build their own GitLab for Slack application.
Related issue:
- [Slack integration shows as only available on .com, in the self-hosted settings?](https://gitlab.com/gitlab-org/gitlab/-/issues/196696)
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