test(ci): lint integration-tagged files and reduce test complexity

[KARTIKrocks]

golangci-lint, go vet, and go test skip files behind //go:build integration by default, so integration_test.go was never linted — hiding gocyclo warnings (complexity 20 > 15) in TestIntegration_BatchPublishAndClearConcurrent and TestIntegration_AnonymousQueueReconnect.

• Pass --build-tags=integration to golangci-lint in both the Makefile and the CI lint job so integration tests are linted (and type-checked) going forward.
• Extract reusable helpers (recvDelivery, waitForReDeclaredQueue, publishUntilDelivered, collectUniqueMessages) to bring both functions under the complexity threshold; behavior is unchanged.

Verified: lint clean in both default and integration modes; full integration suite passes against RabbitMQ 4.3.2.

Summary

Motivation

Fixes #

Changes

Checklist

• fmt, vet, lint, test, build passes (make all)
• New code has tests where appropriate
• Breaking changes are documented

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📥 Commits

Reviewing files that changed from the base of the PR and between 9b00fa6 and d23eac3.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• Makefile
• integration_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/lint-integration-gocyclo

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