chore: remove cloud config deprecated code

[leoparente]

This pull request includes several changes to the agent/config package, primarily focusing on removing the cloud configuration manager and updating type definitions. The most important changes are summarized below:

Removal of Cloud Configuration Manager:

• agent/configmgr/cloud.go: Entire file removed, which included the cloudConfigManager class and its associated methods for handling cloud configurations.
• agent/configmgr/manager.go: Removed the case for creating a cloudConfigManager instance in the New function.

Type Definition Updates:

• agent/config/types.go: Updated the PolicyPayload struct to use any instead of interface{} for the Data field.
• agent/config/types.go: Updated the OrbAgent struct to use any instead of interface{} for the Backends and Policies fields.
• agent/config/types.go: Removed the CloudManager struct and its associated fields from the ManagerSources struct.

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	1.03s	github.com/netboxlabs/orb-agent/agent	0.0%	1	0	0
🟢 PASS	0.35s	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	0.00s	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	0.00s	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: 0.9%

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

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