fix(nuget): discover NuGet.config from working directory

[leno23]

Summary

When NuGet_ConfigFile is not set, Cake now passes the script working directory (not the tools folder) as the root to Settings.LoadDefaultSettings. NuGet then walks parent directories and applies the standard config hierarchy (NuGet.config in repo, user profile, machine-wide, etc.).

Extracted NuGetConfigPathResolver for clarity and unit testing.

Test plan

• NuGetConfigPathResolverTests.Should_Use_Working_Directory_When_Config_File_Not_Specified
• NuGetConfigPathResolverTests.Should_Use_Explicit_Config_File_When_Specified
• CI (no local .NET SDK in contributor environment)

Fixes #2160

Made with Cursor

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