chore: remove viper dependency and simplify yaml parser

[leoparente]

This pull request includes several changes to the orb-agent project, focusing on improving configuration handling, updating dependencies, and removing redundant code. The most important changes include switching from viper to yaml for configuration management, updating type definitions, and cleaning up unused backend-specific variables.

Configuration Management:

• agent/agent.go, cmd/main.go: Replaced viper with yaml for configuration handling, including functions for loading and parsing YAML configuration files. [1] [2] [3]

Type Definitions:

• agent/config/types.go: Updated struct tags from mapstructure to yaml for consistency with the new configuration handling approach. [1] [2]
• agent/backend/backend.go: Changed map[string]interface{} to map[string]any for better type safety and readability.

Code Cleanup:

• Removed backend-specific variable registration functions and their dependencies, as they are no longer needed with the new configuration approach. [1] [2] [3] [4] [5]

Dependency Updates:

• go.mod: Updated dependencies, including adding new ones for yaml and removing viper and mapstructure. [1] [2] [3]

Test Adjustments:

• Updated tests to reflect changes in configuration handling and type definitions. [1] [2] [3] [4]

These changes collectively improve the maintainability and readability of the codebase while ensuring better configuration management.

[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	0.01s	github.com/netboxlabs/orb-agent/agent/backend	0.0%	0	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/devicediscovery	77.7%	2	0	0
🟢 PASS	0.00s	github.com/netboxlabs/orb-agent/agent/backend/mocks	0.0%	0	0	0
🟢 PASS	4.02s	github.com/netboxlabs/orb-agent/agent/backend/networkdiscovery	77.5%	2	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/otel	76.4%	2	0	0
🟢 PASS	3.02s	github.com/netboxlabs/orb-agent/agent/backend/pktvisor	67.8%	2	0	0
🟢 PASS	4.03s	github.com/netboxlabs/orb-agent/agent/backend/worker	76.9%	2	0	0
🟢 PASS	1.06s	github.com/netboxlabs/orb-agent/agent/configmgr	47.9%	9	0	0
🟢 PASS	1.02s	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	2.50s	github.com/netboxlabs/orb-agent/agent/secretsmgr	51.8%	45	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/version	100.0%	1	0	0

Total coverage: 60.6%

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

The release is available on GitHub release

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