Add ValidateNotNullOrEmpty to OutFile and InFile parameters of WebCmdlets

[CarloToso]

PR Summary

Fix Bug: -OutputFile $null / -OutputFile '' cause -OutputFile to be ignored
FIx Bug: -InFile $null cause -InFile to be ignored

PR Context

Fix #19043

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[iSazonov]

@CarloToso Please fix tests.

[CarloToso]

@iSazonov Tests fixed

[iSazonov]

@CarloToso Please add one more negative test if InFile is Directory.

[CarloToso]

Done

[pull-request-quantifier-deprecated]

This PR has 44 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       : +38 -6
Percentile : 17.6%

Total files changed: 2

Change summary by file extension:
.cs : +2 -0
.ps1 : +36 -6

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

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