Fix wildcard globbing in root of device paths

[MartinGC94]

PR Summary

Fixes scenarios like: Get-ChildItem -Path '\\.\C:\*' so it properly handles wildcards at the root.
The code would find the parent of the wildcard (in this case \\.\C:\) but it would leave out the trailing separator (so it would end up like this: \\.\C:) which is not valid for device path roots.
This PR adds a check for root device paths and adds back the missing backslash if needed.

PR Context

Fixes #19439

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[ghost]

This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
Maintainer, please provide feedback and/or mark it as Waiting on Author

[TravisEz13]

reviewed for previous issues I've seen in globbing

[SteveL-MSFT]

Here's two bugs I found while debugging the changes: #19627 and #19626 which affected the tests

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This PR has 42 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Extra Small
Size       : +41 -1
Percentile : 16.8%

Total files changed: 3

Change summary by file extension:
.cs : +12 -1
.ps1 : +29 -0

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[daxian-dbw]

@SteveL-MSFT So the bugs you found are out of scope of the changes in this PR?

[SteveL-MSFT]

@daxian-dbw the bugs were not due to this PR and should be addressed separately

[ghost]

🎉v7.4.0-preview.4 has been released which incorporates this pull request.:tada:

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