fix(dotnet): resolve DotNetRestore paths from WorkingDirectory (#1917)

[leno23]

Summary

Related to #1917.

When DotNetRestoreSettings.WorkingDirectory is set, relative paths for restore artifacts were still resolved against the Cake script directory. This change resolves them against WorkingDirectory instead:

• PackagesDirectory (--packages)
• ConfigFile (--configfile)
• LockFilePath (--lock-file-path)

Adds shared GetAbsoluteDirectoryPath / GetAbsoluteFilePath helpers on DotNetTool.

Complements #4810 / #4811 / #4813.

Test plan

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

Made with Cursor

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