Fix Group-Object so output uses current culture

[SteveL-MSFT]

PR Summary

A regression in Group-Object due to refactoring to use interpolated strings which doesn't take into account CurrentCulture.

PR Context

Fix #20584

PR Checklist

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[pull-request-quantifier-deprecated]

This PR has 4 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Extra Small
Size       : +2 -2
Percentile : 1.6%

Total files changed: 1

Change summary by file extension:
.cs : +2 -2

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