Added -CaseInsensitive switch parameter to Select-Object & Get-Unique cmdlets

[ArmaanMcleod]

PR Summary

Fixes #12059

Added -CaseInsensitive switch parameter to Select-Object & Get-Unique cmdlets.

PR Context

The Select-Object and Get-Unique cmdlets currently do case-sensitive string comparison when filtering unique items, and don't allow the user to override this behaviour and use case-insensitive comparison.

To make sure no breaking change is introduced, the most ideal solution is to introduce a -CaseInsensitive parameter.

Examples

Select-Object -Unique

> "derp", "Derp" | Select-Object -Unique
derp
Derp

> "derp", "Derp" | Select-Object -Unique -CaseInsensitive
derp

Get-Unique

> "aa", "Aa", "bb", "Bb" | Get-Unique
aa
Aa
bb
Bb

> "aa", "Aa", "bb", "Bb" | Get-Unique -AsString -CaseInsensitive
aa
bb

> "aa", "Aa", "bb", "Bb" | Get-Unique -CaseInsensitive
aa
bb

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the title (the WIP bot will keep its status check at Pending while the prefix is present) and remove the prefix when the PR is ready.
• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed: Add -CaseInsensitive switch parameter to Select-Object & Get-Unique cmdlet documentation MicrosoftDocs/PowerShell-Docs#10097
• Testing - New and feature
  • N/A or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • I have considered the user experience from a tooling perspective and opened an issue in the relevant tool repository. This may include:
    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode
      (which runs in a different PS Host).
      • Issue filed:
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
      • Issue filed:
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
      • Issue filed:
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
      • Issue filed:

[pull-request-quantifier-deprecated]

This PR has 34 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       : +29 -5
Percentile : 13.6%

Total files changed: 4

Change summary by file extension:
.cs : +11 -4
.ps1 : +18 -1

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[ghost]

This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
Maintainer, please provide feedback and/or mark it as Waiting on Author

[SteveL-MSFT]

@PowerShell/wg-powershell-cmdlets reviewed this, we agree that adding a -CaseInsensitive switch makes sense particularly the internals also support it and just hard coded to be case sensitive.

[ghost]

This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
Maintainer, please provide feedback and/or mark it as Waiting on Author

[SteveL-MSFT]

LGTM