Notify Slack when dashboard activity lands

[sentry-junior]

When a Slack-rooted conversation continues in the dashboard, Slack gets no signal until someone posts in the thread again.

Current behavior

• Dashboard turns stay conversation-log only (publishExternally: false).
• Later Slack turns can use dashboard history as context and link to the full transcript.
• There is no proactive Slack notice when dashboard-only activity lands.

Gap

• Thread participants who stay in Slack can miss that the conversation moved forward in the UI.
• Full message cross-post is intentionally out of scope (see Start and continue conversations in the dashboard #1200).
• A short notice with a dashboard link would close the gap without impersonating the author or copying message bodies.

Proposal from product discussion

• Post a short Slack notice such as “something was said in the web UI — check the full transcript.”
• Include a link to the dashboard conversation.
• Do not auto-copy dashboard message bodies or impersonate the author.

Related: #1200 (return-to-Slack path only covers the next Slack turn).

Requested by Pierre Massat.

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