fix(contrib/confluentinc/confluent-kafka-go/kafka.v2): ensure kafka.produce span is always finished

[pedroreys]

What does this PR do?

When a nil deliveryChan is passed to the producer.Produce(msg, nil) call, the producer wraps the producer.Events() channel and passes this wrapper channel to the inner .Produce call.

Motivation

When a nil deliveryChan was passed to the producer.Produce call, i.e. when the client was using the producer.Events() channel to get delivery reports, the kafka.produce span was never finished.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• New code is free of linting errors. You can check this by running ./scripts/lint.sh locally.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

Unsure? Have a question? Request a review!

[darccio]

LGTM

[pedroreys]

@darccio thanks! Not sure what's up with the pipeline failure, tho.

[darccio]

@pedroreys You need to run make generate && make fix-modules to fix these failing pipelines. That should be enough.

[pedroreys]

@darccio done. rebased to fix conflicts and then ran make generate and make fix-modules.

[darccio]

/merge

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2025-11-12 09:10:46 UTC ℹ️ Start processing command /merge

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2025-11-12 09:30:22 UTC ℹ️ MergeQueue: merge request added to the queue

The expected merge time in main is approximately 18m (p90).

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2025-11-12 09:45:16 UTC ℹ️ MergeQueue: This merge request was merged