Allow combining of -Skip and -SkipLast parameters in Select-Object cmdlet. (#18849)

* Added SkipLast parameter set to Skip parameter and updated tests

* Using Should -BeExactly with string

* Update test/powershell/Modules/Microsoft.PowerShell.Utility/Select-Object.Tests.ps1

---------

Co-authored-by: Travis Plunk <travis.plunk@microsoft.com>
Co-authored-by: Travis Plunk <github@ez13.net>

src/Microsoft.PowerShell.Commands.Utility/commands/utility/Select-Object.cs

@@ -144,10 +144,11 @@ namespace Microsoft.PowerShell.Commands
         private bool _firstOrLastSpecified;
 
         /// <summary>
-        /// Skips the specified number of items from top when used with First, from end when used with Last.
+        /// Skips the specified number of items from top when used with First, from end when used with Last or SkipLast.
         /// </summary>
         /// <value></value>
         [Parameter(ParameterSetName = "DefaultParameter")]
+        [Parameter(ParameterSetName = "SkipLastParameter")]
         [ValidateRange(0, int.MaxValue)]
         public int Skip { get; set; }
 

test/powershell/Modules/Microsoft.PowerShell.Utility/Select-Object.Tests.ps1

@@ -231,6 +231,29 @@ Describe "Select-Object DRT basic functionality" -Tags "CI" {
         $results[1] | Should -Be 3
     }
 
+    It "Select-Object with SkipLast should work" {
+        $results = "1", "2", "3" | Select-Object -SkipLast 1
+        $results.Count | Should -Be 2
+        $results[0] | Should -BeExactly "1"
+        $results[1] | Should -BeExactly "2"
+    }
+
+    It "Select-Object with Skip and SkipLast should work" {
+        $results = "1", "2", "3" | Select-Object -Skip 1 -SkipLast 1
+        $results.Count | Should -Be 1
+        $results[0] | Should -BeExactly "2"
+    }
+    
+    It "Select-Object with Skip and SkipLast should work with Skip overlapping SkipLast" {
+        $results = "1", "2" | Select-Object -Skip 2 -SkipLast 1
+        $results. Count | Should -Be 0
+    }
+    
+    It "Select-Object with Skip and SkipLast should work with skiplast overlapping skip" {
+        $results = "1", "2" | Select-Object -Skip 1 -SkipLast 2
+        $results. Count | Should -Be 0
+    }
+
     It "Select-Object with Index should work" {
         $results = "1", "2", "3" | Select-Object -Index 2
         $results.Count | Should -Be 1