fix: read the root of a drive for patterns like C:/* on Windows

[SulimanAbdulrazzaq]

What is the purpose of this pull request?

Fixes #375. On Windows, a pattern for the root of a drive, such as C:/*, lists the current working directory instead of the drive root.

glob-parent returns C: as the base directory of C:/* (gulpjs/glob-parent#63). Windows resolves a drive letter without a separator to the current directory on that drive, so path.resolve(cwd, 'C:') is the cwd. The entries found there are then reported under the drive, for example C:/src for the repository's own src directory. C:/./* already works because its base is C:/..

What changes did you make? (Give an overview)

• groupPatternsByBaseDirectory now keeps the trailing slash when the base is a bare drive letter taken from a X:/… pattern, so the base of C:/* is C:/, the same way /* gets /. This only applies on Windows. On other platforms C: is an ordinary relative directory name, so nothing changes there.
• The check is a small helper in utils/path next to appendTrailingSeparatorToDeviceRoot, and it runs after getBaseDirectory rather than inside it.
• Tests:
  • A unit test for the helper.
  • A grouping test in managers/tasks.spec.ts.
  • A globSync test that uses a custom fs.readdirSync to check that the drive root is the directory being read.

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[SulimanAbdulrazzaq]

@mrmlnc when you have a moment, could you approve the workflow runs on this one? It fixes #375: on Windows, a pattern for the root of a drive such as C:/* lists the current working directory instead of the drive root. CI, Benchmark and CodeQL are waiting for approval, and the branch has no conflicts.

[SulimanAbdulrazzaq]

@mrmlnc when you have a moment, could one of you approve the workflow runs and take a look at this one? No checks have run on the current head yet.