MQTT tests: start just required dependencies (backport #14039) #14063
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MQTT tests depend on a few plugins, which are just used in 1 or 2 suites each. These have caused issues in CI, triggering a bug in rabbitmq_federation where the mirrored supervisor submits a transaction while the cluster is being shut down. The transaction hangs and the whole rabbitmq_mqtt job times out.
This bug has been addressed, however it is best to start just the required plugins on each SUITE.
This is an automatic backport of pull request #14039 done by [Mergify](https://mergify.com).