fix: handle policies as a string

[jajeffries]

This pull request enhances the handling of policy data in the agent's configuration manager by adding support for YAML-formatted policy payloads. When a policy is received with its data as a YAML string, the code now attempts to unmarshal it into a structured map before passing it to the policy manager. Comprehensive tests have been added to ensure correct behavior for various input scenarios, including YAML strings, structured data, empty or invalid YAML, and non-YAML formats.

Policy Data Handling Improvements:

• Added logic in handleAgentPolicies to detect YAML-formatted policy data provided as a string, unmarshal it into a map, and handle errors gracefully by logging a warning and falling back to the original data if unmarshaling fails (agent/configmgr/fleet/from_rpc.go).
• Imported the gopkg.in/yaml.v3 package to support YAML unmarshaling (agent/configmgr/fleet/from_rpc.go).

Testing Enhancements:

• Added unit tests to cover the new YAML handling logic, including cases for valid YAML strings, structured data (backward compatibility), empty YAML strings, invalid YAML, and non-YAML formats (agent/configmgr/fleet/from_rpc_test.go).

[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	1.11s	github.com/netboxlabs/orb-agent/agent/backend	33.3%	30	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	4.02s	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	1.01s	github.com/netboxlabs/orb-agent/agent/config	100.0%	6	0	0
🟢 PASS	31.18s	github.com/netboxlabs/orb-agent/agent/configmgr	49.8%	14	0	0
🟢 PASS	4.54s	github.com/netboxlabs/orb-agent/agent/configmgr/fleet	71.3%	126	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/policies	100.0%	15	0	0
🟢 PASS	1.02s	github.com/netboxlabs/orb-agent/agent/policymgr	71.2%	10	0	0
🟢 PASS	33.22s	github.com/netboxlabs/orb-agent/agent/secretsmgr	48.9%	54	0	0
🟢 PASS	1.02s	github.com/netboxlabs/orb-agent/agent/telemetry	81.0%	19	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/version	100.0%	1	0	0

Total coverage: 63.3%

[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 📦🚀