Add GitHub Actions workflow for Copilot environment setup and consolidate .NET setup across all workflows#830

BenjaminMichaelis merged 10 commits into

v12.0IntelliTect/EssentialCSharp:v12.0from

copilot/fix-11d16f53-d3c4-4ff7-8b5a-30c6a14c15bbIntelliTect/EssentialCSharp:copilot/fix-11d16f53-d3c4-4ff7-8b5a-30c6a14c15bbCopy head branch name to clipboard