Fix Group-Object output using interpolated strings

[mawosoft]

PR Summary

Fixes regression from #20608 which mixed up use of StringBuilder.AppendFormat and interpolated strings, thereby passing the actual value to be formatted as the format string.

PR Context

Fixes #20711.

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[mawosoft]

cc @SteveL-MSFT, @iSazonov

[iSazonov]

@mawosoft Thanks! Please add test(s) to avoid future regressions.

[mawosoft]

@microsoft-github-policy-service agree

[mawosoft]

@iSazonov Test added.

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This PR has 10 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       : +8 -2
Percentile : 4%

Total files changed: 2

Change summary by file extension:
.cs : +2 -2
.ps1 : +6 -0

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[iSazonov]

@SteveL-MSFT Maybe backport?

[Moazzem-Hossain-pixel]

Thanks