Filter /github subscribe release notifications by prerelease status

[Enigo]

🏷️ Discussion Type

Product Feedback

💬 Feature/Topic Area

Apps

Body

Summary — The GitHub for Slack integration (/github subscribe owner/repo releases) sends a Slack message for every published release, with no way to distinguish full releases from pre-releases.

Problem — Many CD pipelines publish a pre-release (prerelease: true) on stage deploys and a full release (prerelease: false) on prod promotion. The releases subscription fires on the published event regardless of the prerelease flag, so channels get pinged on every stage deploy — drowning the production-release signal teams actually want.

Requested behavior — A prerelease filter mirroring the existing workflows:{event,branch} filter syntax:

/github subscribe owner/repo releases:{prerelease:false}
/github subscribe owner/repo releases:{prerelease:true}

(The prerelease:false qualifier already exists in GitHub's release search UI — just not for Slack.)

Related — #178699 (same request class, for PRs); native-notification equivalents #4993, #29192, #10776, #17052.

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