Fix progress calculation divide by zero in Copy-Item

[adityapatwardhan]

PR Summary

Fix issue caused by #18735.

In cases where the file length is 0 bytes, it causes a divide by 0 error. The fix adds a conditional to check for the length and makes percentage as 100% if the total length is 0 bytes.

PR Context

PR Checklist

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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[pull-request-quantifier-deprecated]

This PR has 6 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       : +5 -1
Percentile : 2.4%

Total files changed: 2

Change summary by file extension:
.cs : +1 -1
.ps1 : +4 -0

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🎉v7.4.0-preview.2 has been released which incorporates this pull request.:tada:

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