Add classname to user interaction

[SpennyNDaJets]

Summary

Add classname to user interaction event

How did you test this change?

Are there any deployment considerations?

N/A

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Note

Adds event.classname to user interaction spans, introduces a Go OpenTelemetry e2e example (collector + app), and updates Go/OTel dependencies and versions across modules.

• Web SDK (user interaction):
  • Add event.classname attribute to spans and bump instrumentation version to 0.1.1 in sdk/highlight-run/src/client/otel/user-interaction.ts.
• E2E OpenTelemetry (Go):
  • Add new Go example app (e2e/opentelemetry/go) with OTel setup (main.go, otel.go, rolldice.go).
  • Add OTel Collector config and Docker Compose (collector.yml, compose.yml).
• Go modules and deps:
  • Upgrade OTel libraries and related deps; bump Go versions in e2e/go, sdk/highlight-go, and e2e/go-plugin.
  • Refresh go.mod/go.sum with newer versions (e.g., otelhttp, otel core, gqlgen, gqlparser, fasthttp, samber/lo, testify).
• Misc:
  • Minor formatting/JSON normalization in Flutter and .NET example configs.

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