fix(dotnet): resolve DotNetPackageAdd directory from WorkingDirectory (#1917)

[leno23]

Summary

Related to #1917.

When DotNetPackageAddSettings.WorkingDirectory is set, relative PackageDirectory was still resolved against the Cake script directory. It is now resolved against WorkingDirectory.

Adds shared GetAbsoluteDirectoryPath / GetAbsoluteFilePath helpers on DotNetTool.

Complements #4810–#4815.

Test plan

• Added unit test Should_Resolve_PackageDirectory_Relative_To_WorkingDirectory
• CI: Cake.Common.Tests (no local .NET SDK; relying on GitHub Actions)

Made with Cursor

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