fix: corrects vault yaml config

[jajeffries]

Fixes #174

This pull request improves the handling and testing of YAML serialization and validation for the AuthAppRole struct in the Vault authentication code. The main focus is on ensuring that optional fields are correctly omitted from YAML output when empty and that required fields are validated during unmarshaling. Comprehensive unit tests have been added to verify these behaviors.

Improvements to YAML serialization and validation

• Fixed the struct tags for WrappingToken and MountPath in AuthAppRole to use the correct omitempty option, ensuring empty values are omitted during YAML marshaling.

Enhancements to unit testing

• Added new tests in vault_auth_test.go to verify that YAML marshaling omits empty fields and that unmarshaling correctly reconstructs the struct, including edge cases for optional and required fields.
• Added tests to validate that missing required fields (role_id, secret_id) in the YAML input result in appropriate errors during unmarshaling.

Test infrastructure updates

• Imported the yaml.v3 package to support YAML marshaling and unmarshaling in tests.
• Added a helper function stringPtr to simplify pointer creation for test cases.

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	0.14s	github.com/netboxlabs/orb-agent/agent	0.0%	0	0	0
🟢 PASS	0.14s	github.com/netboxlabs/orb-agent/agent/backend	0.0%	0	0	0
🟢 PASS	5.03s	github.com/netboxlabs/orb-agent/agent/backend/devicediscovery	76.0%	3	0	0
🟢 PASS	0.01s	github.com/netboxlabs/orb-agent/agent/backend/mocks	0.0%	0	0	0
🟢 PASS	8.04s	github.com/netboxlabs/orb-agent/agent/backend/networkdiscovery	76.2%	7	0	0
🟢 PASS	4.02s	github.com/netboxlabs/orb-agent/agent/backend/otel	76.4%	2	0	0
🟢 PASS	3.02s	github.com/netboxlabs/orb-agent/agent/backend/pktvisor	65.6%	2	0	0
🟢 PASS	8.04s	github.com/netboxlabs/orb-agent/agent/backend/snmpdiscovery	75.8%	7	0	0
🟢 PASS	5.03s	github.com/netboxlabs/orb-agent/agent/backend/worker	76.0%	3	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/config	100.0%	6	0	0
🟢 PASS	1.06s	github.com/netboxlabs/orb-agent/agent/configmgr	49.2%	9	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	70.3%	10	0	0
🟢 PASS	26.28s	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: 58.7%

[github-actions]

🎉 This PR is included in version 2.4.2 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀