[Improvement] Add LocalBuild agent

[arturcic]

Currently the build agent is set to null if there is none build agents found that can be resolved from the environment variables

The current improvement adds a LocalBuild agent that is set as CurrentBuildAgent in case none other agents are found.

[github-actions]

🎉 This issue has been resolved in version 5.8.3 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

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