chore: remove mqtt dependency

[leoparente]

This pull request focuses on removing the dependency on the paho.mqtt.golang library from the agent package and its related backends. The changes involve cleaning up the codebase by eliminating MQTT client references and associated configurations.

Key changes include:

Removal of MQTT Dependency:

• agent/agent.go: Removed the import of paho.mqtt.golang and references to the MQTT client and related configurations. This includes removing the MQTT client initialization, logging configurations, and cleanup during agent stop. [1] [2] [3] [4] [5] [6] [7]

• agent/backend/backend.go: Removed the import of paho.mqtt.golang and the SetCommsClient method from the Backend interface. [1] [2]

Backend-Specific Changes:

• agent/backend/devicediscovery/device_discovery.go: Removed the import of paho.mqtt.golang and the mqttClient field along with the SetCommsClient method. [1] [2] [3]

• agent/backend/networkdiscovery/network_discovery.go: Removed the import of paho.mqtt.golang and the mqttClient field along with the SetCommsClient method. [1] [2] [3]

• agent/backend/otel/otel.go: Removed the import of paho.mqtt.golang and the mqttClient field along with the SetCommsClient method. [1] [2] [3]

• agent/backend/pktvisor/pktvisor.go: Removed the import of paho.mqtt.golang, the mqttClient field, and the SetCommsClient method. [1] [2] [3]

• agent/backend/worker/worker.go: Removed the import of paho.mqtt.golang and the mqttClient field along with the SetCommsClient method. [1] [2] [3]

Other Changes:

• agent/logging.go: Removed the file entirely as it contained MQTT-specific logging implementations.

• go.mod: Removed the dependency on paho.mqtt.golang from the module requirements. [1] [2]

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	1.02s	github.com/netboxlabs/orb-agent/agent	0.0%	1	0	0
🟢 PASS	0.20s	github.com/netboxlabs/orb-agent/agent/backend	0.0%	0	0	0
🟢 PASS	0.00s	github.com/netboxlabs/orb-agent/agent/backend/devicediscovery	0.0%	0	0	0
🟢 PASS	0.00s	github.com/netboxlabs/orb-agent/agent/backend/networkdiscovery	0.0%	0	0	0
🟢 PASS	0.00s	github.com/netboxlabs/orb-agent/agent/backend/otel	0.0%	0	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/backend/pktvisor	0.0%	0	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/backend/worker	0.0%	0	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/configmgr	0.0%	0	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/policies	0.0%	0	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/policymgr	0.0%	0	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/version	100.0%	1	0	0

Total coverage: 0.8%

[github-actions]

🎉 This PR is included in version 1.2.0 🎉

The release is available on GitHub release

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