[CWS] close query chan when finishing the btfhub collector

[paulcacheux]

What does this PR do?

fixes #25431

Motivation

Additional Notes

Possible Drawbacks / Trade-offs

Describe how to test/QA your changes

[paulcacheux]

/merge

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[pr-commenter]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv create-vm --pipeline-id=34018672 --os-family=ubuntu

[agent-platform-auto-pr]

[Fast Unit Tests Report]

On pipeline 34018672 (CI Visibility). The following jobs did not run any unit tests:

Jobs:

• tests_deb-arm64-py3
• tests_deb-x64-py3
• tests_flavor_dogstatsd_deb-x64
• tests_flavor_heroku_deb-x64
• tests_flavor_iot_deb-x64
• tests_rpm-arm64-py3
• tests_rpm-x64-py3
• tests_windows-x64

If you modified Go files and expected unit tests to run in these jobs, please double check the job logs. If you think tests should have been executed reach out to #agent-developer-experience

[dd-devflow]

🚂 MergeQueue

Pull request added to the queue.

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Use /merge -c to cancel this operation!