Change how relative paths in Resolve-Path are handled when using the RelativeBasePath parameter

[MartinGC94]

PR Summary

Changes how the Path and LiteralPath parameters treat relative input when RelativeBasePath is specified. Previously it would resolve the full path, based on the current directory and then use that to create the relative path. See this demonstration:

PS C:\Users\Martin> Resolve-Path -Path '..\Program Files\' -RelativeBasePath C:\Windows
Resolve-Path: Cannot find path 'C:\Users\Program Files\' because it does not exist.

Now it returns the full, or relative path based off the user specified RelativeBasePath:

PS C:\Users\Martin> Resolve-Path -Path '..\Program Files\' -RelativeBasePath C:\Windows

Path
----
C:\Program Files\

PS C:\Users\Martin> Resolve-Path -Path '..\Program Files\' -RelativeBasePath C:\Windows -Relative
..\Program Files

The relative output may not seem very useful since it's just outputting what the user wrote, but it shows its use when using wildcards:

PS C:\Users\Martin> Resolve-Path -Path '..\Program*' -RelativeBasePath C:\Windows -Relative
..\Program Files
..\Program Files (x86)

This is a breaking change from the current behavior (implemented here: #19358 ) but since it hasn't made its way into a full release yet, it should be fine. This also means this PR should be prioritized to get merged before the next GA release.

Regarding the actual implementation, it feels wrong pushing and popping the location but none of the relevant APIs seemed to support arbitrary paths and it seemed like it would be a lot of work to add it. Maybe someone else has a better suggestion but if not, I hope it's not a blocker.

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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

[SteveL-MSFT]

Can't immediately think of a way to solve this without push/pop of the location, but I don't think that's a big deal. Agree we can fix this behavior since it was introduced in a preview.

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Total files changed: 2

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.cs : +36 -35
.ps1 : +44 -3

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[SteveL-MSFT]

LGTM