Allow preview suffix for PowerShellEditorServices too

Since I do actually plan to use it to preview a PSReadLine preview.
PowerShell · andyleejordan · Mar 23, 2023 · Mar 17, 2023 · Mar 17, 2023 · Mar 17, 2023
commit fc9bdd61adc08cf44cb4bb5d425210f7fd9910f6
diff --git a/tools/VersionTools.psm1 b/tools/VersionTools.psm1
@@ -144,7 +144,9 @@ function Test-VersionIsValid {
         }
         "PowerShellEditorServices" {
             if ($SemanticVersion.PreReleaseLabel) {
-                throw "Version shouldn't have a pre-release label!"
+                if ($SemanticVersion.PreReleaseLabel -ne "preview") {
+                    throw "Suffix should only be 'preview'!"
+                }
             }
         }
     }