View issue / merge request state in unfurled issue link in Slack

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Background

• When an issue is pasted in Slack, the link is unfurled, and certain fields of the issue are displayed in a preview.
• We want to provide more integration and enable users to stay in Slack if they need to.

Description

• View the issue state (open, closed) in the preview.
• Same for merge requests (open, closed, merged).

References

https://api.slack.com/docs/message-link-unfurling