Add polyfill for Path.Combine(params ...)

[Tyrrrz]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a polyfill for Path.Combine(params string[]) to enable the variadic overload of Path.Combine for projects targeting .NET Framework versions prior to .NET 4.0.

Key Changes:

• Implements Path.Combine(params string[]) using LINQ's Aggregate method to successively combine paths
• Uses conditional compilation to only apply the polyfill for NETFRAMEWORK && !NET40_OR_GREATER targets

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[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (63b4718) to head (60ab459).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@     Coverage Diff      @@
##   master   #26   +/-   ##
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