feat: remove dataset from agent

[jajeffries]

This pull request adds support for handling the dataset_removed RPC message in the agent's messaging system. It introduces logic to process dataset removal events, ensures robust error handling for malformed messages or missing dependencies, and provides comprehensive test coverage for the new functionality.

Support for dataset removal handling:

• Added logic in DispatchToHandlers (in from_rpc.go) to handle the dataset_removed RPC function by decoding the payload and invoking a new handler, handleDatasetRemoval.
• Implemented the handleDatasetRemoval method to retrieve the relevant policy, check for backend existence, and remove the specified dataset from the policy using the backend.

Testing improvements:

• Extended the main dispatch test (TestMessageHandlers_DispatchToHandlers) to cover the dataset_removed message type, verifying correct interaction with policy manager and backend logic.
• Added targeted tests for error scenarios and handler logic:
  • Test for malformed dataset_removed payloads to ensure errors are handled gracefully.
  • Tests for successful dataset removal, as well as failures due to policy retrieval errors or missing backend, checking that the handler behaves correctly in each case.

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent	0.0%	0	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/backend	0.0%	0	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/devicediscovery	79.4%	2	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/backend/mocks	0.0%	0	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/networkdiscovery	80.6%	2	0	0
🟢 PASS	4.02s	github.com/netboxlabs/orb-agent/agent/backend/opentelemetryinfinity	74.1%	2	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/pktvisor	71.7%	2	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/snmpdiscovery	80.2%	2	0	0
🟢 PASS	5.03s	github.com/netboxlabs/orb-agent/agent/backend/worker	80.6%	3	0	0
🟢 PASS	1.02s	github.com/netboxlabs/orb-agent/agent/config	100.0%	6	0	0
🟢 PASS	31.16s	github.com/netboxlabs/orb-agent/agent/configmgr	51.5%	13	0	0
🟢 PASS	4.42s	github.com/netboxlabs/orb-agent/agent/configmgr/fleet	67.5%	74	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/policies	100.0%	15	0	0
🟢 PASS	1.03s	github.com/netboxlabs/orb-agent/agent/policymgr	70.3%	10	0	0
🟢 PASS	30.20s	github.com/netboxlabs/orb-agent/agent/secretsmgr	48.9%	54	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/version	100.0%	1	0	0

Total coverage: 62.4%

[github-actions]

🎉 This PR is included in version 2.5.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 2.5.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀