Handle relative paths in PowerShell cmdlet

[PrzemyslawKlys]

Summary

• resolve Get-IISParsedLog paths via PowerShell provider before validating
• add tests for relative file paths and unit test for parser
• include example showing relative path usage

Testing

• dotnet test
• pwsh -NoLogo -Command "Import-Module ./Module/IISParser.psd1 -Force; Invoke-Pester Module/Tests/Get-IISParsedLog.Tests.ps1 -CI"

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https://chatgpt.com/codex/tasks/task_e_68ac7a6aa1c4832ea020c4cfddf30d53

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.40%. Comparing base (0efcd31) to head (e7a55aa).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   86.40%   86.40%           
=======================================
  Files           5        5           
  Lines         206      206           
  Branches       35       35           
=======================================
  Hits          178      178           
  Misses         20       20           
  Partials        8        8           

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