Sync eng/common directory with azure-sdk-tools for PR 9896 (#6430)

* Remove trailing slash addition to ExcludePaths

* Remove the needless loop and, now defunct, comment

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Co-authored-by: James Suplizio <jasupliz@microsoft.com>

eng/common/scripts/Package-Properties.ps1

@@ -185,14 +185,7 @@ function Get-PrPkgProperties([string]$InputDiffJson) {
         $targetedFiles += $diff.DeletedFiles
     }
 
-    # The exclude paths and the targeted files paths aren't full OS paths, they're
-    # GitHub paths meaning they're relative to the repo root and slashes are forward
-    # slashes "/". The ExcludePaths need to have a trailing slash added in order
-    # correctly test for string matches without overmatching. For example, if a pr
-    # had files sdk/foo/file1 and sdk/foobar/file2 with the exclude of anything in
-    # sdk/foo, it should only exclude things under sdk/foo. The TrimEnd is just in
-    # case one of the paths ends with a slash, it doesn't add a second one.
-    $excludePaths = $diff.ExcludePaths | ForEach-Object { $_.TrimEnd("/") + "/" }
+    $excludePaths = $diff.ExcludePaths
 
     $additionalValidationPackages = @()
     $lookup = @{}