[SecureShellServer] Fix all compilations errors and warnings

[VeithMetro]

In the end, at the current state the plugin will not work without a proper Dropbear hack - making it build a library that we can link against. So in the future, it would probably be best to drop Dropbear entirely, and move towards a different method of managing the SSH connections

[Copilot]

Pull Request Overview

This PR fixes compilation errors and warnings in the SecureShellServer plugin. The main changes focus on correcting data type mismatches, updating method signatures, and improving the Dropbear library configuration.

• Update JSON data structure references from SessioninfoResultData to GetactivesessionsinfoResultDataElem to match the API schema
• Fix CMake configuration to properly link against static Dropbear libraries and dependencies
• Add proper error handling for Dropbear service initialization

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
SecureShellServer/cmake/FindLibDropbear.cmake	Updates CMake module to find static libraries and additional dependencies (libtomcrypt, libtommath)
SecureShellServer/SecureShellServerJsonRpc.cpp	Updates JSON-RPC method signatures and data type conversions
SecureShellServer/SecureShellServer.h	Updates header declarations to match new data types and fix const correctness
SecureShellServer/SecureShellServer.cpp	Implements error handling for Dropbear initialization and updates data structure usage

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