fix: H.stop should stop otel exporters

[Vadman97]

Summary

Ensure that H.stop() shuts down OpenTelemetry exporters.

How did you test this change?

H.stop() now stops otel instrumentation; tested via e2e nextjs app

Are there any deployment considerations?

no

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Note

H.stop() now flushes and shuts down OTEL tracer/meter providers; e2e app adds buttons to record a metric and start/stop.

• SDK (client/OTEL):
  • sdk/highlight-run/src/client/index.tsx: stopRecording() now calls shutdown() to flush and stop OTEL providers.
  • sdk/highlight-run/src/client/otel/index.ts: Refactor shutdown to run tracer/meter flush+shutdown in parallel and clear provider refs.
• E2E app:
  • e2e/nextjs/src/app/components/highlight-buttons.tsx: Add buttons to trigger H.recordMetric, H.start(), and H.stop().

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