chore: remove duplicated code in orb backends

[leoparente]

This pull request includes several changes to improve the consistency and code reuse across different backend components (device discovery, network discovery, and open telemetry). The changes primarily focus on updating the way requests are made to backend services and replacing the interface{} type with the more modern any type.

Improvements to request handling and code reuse:

• agent/backend/devicediscovery/device_discovery.go: Replaced custom request handling logic with backend.CommonRequest and updated the Configure, GetCapabilities, ApplyPolicy, and RemovePolicy methods to use any instead of interface{}. [1] [2] [3] [4] [5] [6] [7] [8]
• agent/backend/devicediscovery/utils.go: Removed the getProcRunningStatus and request functions in favor of using backend.CommonRequest.

Consistency improvements in network discovery:

• agent/backend/networkdiscovery/network_discovery.go: Similar updates as in device discovery, including replacing interface{} with any and using backend.CommonRequest for making requests. [1] [2] [3] [4] [5] [6] [7] [8]
• agent/backend/networkdiscovery/utils.go: Removed the getProcRunningStatus and request functions, as they are now redundant.

Updates in open telemetry backend:

• agent/backend/otel/otel.go: Updated the Configure, GetCapabilities, and other methods to use any instead of interface{} and replaced custom request handling with backend.CommonRequest. [1] [2] [3] [4] [5]

These changes enhance the maintainability and readability of the code by standardizing request handling and modernizing type usage across different backend components.

[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	0.02s	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	0.01s	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	1.72s	github.com/netboxlabs/orb-agent/agent/secretsmgr	8.0%	7	0	0
🟢 PASS	1.01s	github.com/netboxlabs/orb-agent/agent/version	100.0%	1	0	0

Total coverage: 1.9%