fix(traceVisQuery): Select lower(SpanKind) for compatibility with PeerService visualization

[jSwanson99]

Type of Change

Please check the relevant option.

• 🚀 Feature
• 🐛 Bug Fix
• 📝 Documentation
• 🧹 Refactor / Chore

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Bug Fix

What is the bug?

The grafana trace vis expect SpanKind to be in lowercase, and not providing it in lowercase results in your client spans not being recognized as client spans. Here is where its checked: TraceTimelineViewer/utils.tsx

The reason why its useful for this check to be accurate, is because the PeerService functionality requires the SpanKind of the associated span to be client. See attached images to see what this functionality is. Here's where the vis cares about SpanKind VirtualizedTraceView.tsx

How to reproduce

1. Using clickhouse datasource, load a client span with span.attributes['peer.service'] set to 'foo'
2. Observe the UI doesn't react
3. Using tempo datasource, load a client span with span.attributes['peer.service'] set to 'foo'
4. Observe some nice eye candy

Environment (if no related issue)

If there is no open issue, please specify the versions where the bug occurs.

• ClickHouse version: clickhouse/clickhouse-server:26.1.1.912
• Grafana version: Grafana v12.3.0 (20051fb1fc)
• Plugin version: Not sure where to find this. if someone comments where this is, I'll update this

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Screenshots / Videos

Please provide screenshots or videos demonstrating the bug or the feature working. This helps reviewers understand the change visually and speeds up the review process.

Before:

After:

Its a small change that's quite helpful when you don't own the service which you are calling

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Please check that:

• Tests for this change have been added/updated.
• Documentation has been added/updated (where applicable).

I'd say docs update is not applicable. Its a feature of otel https://opentelemetry.io/docs/specs/semconv/registry/attributes/peer/

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