[ENH](fn-consumer): List in-progress jobs

[tanujnay112]

Summary

Adds ListInProgressJobs to the fn-consumer gRPC service so operators can inspect work running on an individual consumer.

• returns the attached function ID and expiry time for each active job
• reads the in-progress map through the FnConsumerManager message queue
• exposes no mutation or cancellation behavior

Testing

• cargo test -p worker --lib fn_consumer::fn_consumer_manager::tests

[tanujnay112]

• [ENH](fn-consumer): List in-progress jobs #7668 👈 (View in Graphite)
• main

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[github-actions]

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T19:45:50.951590Z	9c1e3e1	Manual request

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💡 Codex Review

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Reviewed commit: e03f535270

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[tanujnay112]

@codex review

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Codex Review: Didn't find any major issues. What shall we delve into next?

Reviewed commit: 9c1e3e10a3

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