Run tests against LavinMQ and RabbitMQ

[walro]

• Run both brokers for all the standard test (invoked by bundle exec rake test)
• Only use LavinMQ for TLS and macOS tests (to keep it simple)
• Use RabbitMQ for tests that shell out to rabbitmqctl, there is no direct replacement in lavinmqctl

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TODO: Doens't work today due to subtle differences in LavinMQ and RabbitMQ. Run with allow-failure for LavinMQ?

[Copilot]

Pull request overview

Updates CI to run the default test suite against LavinMQ, while isolating RabbitMQ-specific (sudo/rabbitmqctl) behavior into a separate test task and CI job.

Changes:

• Switch GitHub Actions Linux/macOS broker setup from RabbitMQ to LavinMQ; add a dedicated RabbitMQ sudo test job.
• Move blocked-connection (rabbitmqctl) tests out of the default AMQP lifecycle suite into test/rabbitmq/....
• Update Rake test tasks to exclude RabbitMQ-specific tests from the default runs and add test:rabbitmq.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/test_helper.rb	Removes global sudo-skip helper previously used by RabbitMQ-only tests.
test/amqp/client_lifecycle_test.rb	Removes blocked-connection tests from the default suite.
test/rabbitmq/amqp/client_lifecycle_test.rb	Adds RabbitMQ-only blocked-connection tests runnable via a dedicated task/job.
Rakefile	Excludes RabbitMQ-specific tests from default tasks; adds test:rabbitmq.
.github/workflows/main.yml	Uses LavinMQ for the main test matrix/TLS/macos; adds a RabbitMQ sudo job for RabbitMQ-only tests.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

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