fix: preserve folder structure when glob matches only subdirectories (#2102)

[leno23]

Summary

• When CopyFiles is called with preserveFolderStructure: true and a glob pattern, derive the structure base directory from the pattern prefix (text before the first *, ?, or {).
• Use that base (e.g. src from src/**/*.dat) instead of inferring a common path only from matched file paths, which failed when every match lived in a subdirectory.

Test plan

• Should_Preserve_Subdirectory_Structure_When_Only_Subdirectory_Files_Match_Glob — single src/sub/file3.dat via ./src/**/*.dat lands at dst/sub/file3.dat
• Existing FileCopierTests (CI)

CI not run locally (no .NET SDK in contributor environment).

Fixes #2102

Made with Cursor

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