docs: add Slack source indicator documentation

[inkeep]

Summary

Documents the new Slack source indicator feature added in #2091.

Changes

Slack Configuration (configuration.mdx)

• Added "Tracking Slack conversations" section explaining:
  • # badge on conversation list items
  • # icon with Slack-purple styling in trace timeline
  • Dedicated "Slack Conversations" stat card
  • Tip about using invocation.type='slack' for SigNoz filtering

Traces (traces.mdx)

• Added paragraph in Visual Builder Traces Interface section noting that Slack conversations display a # badge and "Slack message received" label

SigNoz Usage (signoz-usage.mdx)

• Added filter example showing how to filter by Slack conversations using invocation.type = "slack"

Spans and Traces Contributing Guide (spans.mdx)

• Added "Invocation Attributes" subsection documenting:
  • invocation.type attribute for tracking source platform
  • invocation.entryPoint attribute for specific interaction types
  • Code example showing how to read from HTTP headers
  • Reference table with example values

---

Related to #2091

/cc @amikofalvy

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Project	Deployment	Actions	Updated (UTC)
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