feat(kvevents): trace raw message processing

[larainema]

Summary

• Add an internal OpenTelemetry span around kvevents raw-message processing.
• Record transport attributes before parsing, then pod/model/event-count attributes after parsing.
• Mark parse failures with OTel error status.
• Add unit tests for span attributes and parse-error status.
• Fix the UDS e2e HostConfig import to match the current testcontainers-go Moby API and keep repo lint green.

Fixes #639
Refs #617

Testing

• go test ./pkg/kvevents
• go test ./pkg/...
• go test ./tests/e2e/uds_tokenizer -run '^$'
• go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.9.0 run ./tests/e2e/uds_tokenizer

[github-actions]

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