Add comprehensive test suite, fix minor issues, rename function and file names to match approved verbs (#708)

Scripts/Helpers/Get-FriendlyTargetUserName.ps1

@@ -0,0 +1,13 @@
+<#
+    .SYNOPSIS
+        Returns a readable description of the current app-removal target.
+#>
+function Get-FriendlyTargetUserName {
+    $target = Get-TargetUserForAppRemoval
+
+    switch ($target) {
+        "AllUsers" { return "all users" }
+        "CurrentUser" { return "the current user" }
+        default { return "user $target" }
+    }
+}