Implementation Completed ✅

This PR updates both SetupNugetSources.ps1 and SetupNugetSources.sh scripts to add internal feeds for dotnet-eng and dotnet-tools when their public counterparts are present.

Changes Completed:

• Update SetupNugetSources.ps1 to detect and add dotnet-eng-internal when dotnet-eng is present
• Update SetupNugetSources.ps1 to detect and add dotnet-tools-internal when dotnet-tools is present
• Update SetupNugetSources.sh to detect and add dotnet-eng-internal when dotnet-eng is present
• Update SetupNugetSources.sh to detect and add dotnet-tools-internal when dotnet-tools is present
• Add test cases for dotnet-eng feed detection and internal feed addition
• Add test cases for dotnet-tools feed detection and internal feed addition
• Run existing tests to ensure no regressions (30/30 tests pass)
• Manually verify the changes work correctly
• Update documentation in script headers
• Code review completed with no issues
• Security summary documented
• Revert unintended .gitignore changes

Summary:

Both PowerShell and Shell scripts now detect the presence of dotnet-eng and dotnet-tools public feeds and automatically add their corresponding internal feeds:

• dotnet-eng → dotnet-eng-internal
• dotnet-tools → dotnet-tools-internal

The implementation follows the existing pattern used for dotnet version feeds (dotnet5-10). All 30 tests pass including 5 new tests that verify the new functionality.

Testing Results:

• ✅ All 30 unit tests pass (25 existing + 5 new)
• ✅ Manual verification with Shell script - feeds added correctly
• ✅ Manual verification with PowerShell script - feeds added correctly
• ✅ Verified compatibility with existing dotnet version feeds (dotnet5-10)
• ✅ Code review completed with no issues

Security Summary:

• No new security vulnerabilities introduced
• Changes follow the exact same pattern as existing code for dotnet5-10 feeds
• Simple string matching and feed URL construction using established patterns
• All feed URLs use the same secure Azure DevOps endpoint structure

Related Issue:

Context: https://github.com/dotnet/release/issues/1617

This ensures internal package sources are available during builds and dependency restoration for both .NET 10 and .NET 11 channels.

• Fixes Update SetupNuGetSources scripts to ensure internal feeds are added when public feeds are present for .NET 10 and .NET 11 #16245

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