[Infra] Move CFamily jar processing from MSBuild task to exe

[duncanp-lseg]

• added a new console app that does the equivalent of the current DownloadSonarPlugin targets/tasks for the CFamily.
• changed the VSIX project to use the new console app

At the moment, the processing is the same as before i.e. the app will copy all of the required files to the target lib folder in the VSIX project.

Part of #2315

[duncanp-lseg]

I've manually tested that the correct files are copied on first and subsequent builds. I've also compared the CFamily files embedded in the VSIX against the current release build, and they are the same. I'll do another check against the artefacts produced in the PR build.

[sonarqubecloud[bot]]

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