update PR validation log message(#470)

.script/utils/gitWrapper.ts

@@ -27,8 +27,8 @@ export async function GetDiffFiles(fileTypeSuffixes?: string[], filePathFolderPr
     return;
   }
 
-  let fileTypeSuffixesLogValue = typeof fileTypeSuffixes === "undefined" ? null : fileTypeSuffixes.toString();
-  let filePathFolderPreffixesLogValue = typeof filePathFolderPreffixes === "undefined" ? null : filePathFolderPreffixes.toString();
+  let fileTypeSuffixesLogValue = typeof fileTypeSuffixes === "undefined" ? null : fileTypeSuffixes.join(",");
+  let filePathFolderPreffixesLogValue = typeof filePathFolderPreffixes === "undefined" ? null : filePathFolderPreffixes.join(",");
   console.log(`${filterChangedFiles.length} files changed in current PR after filter. File Type Filter: ${fileTypeSuffixesLogValue}, File path Filter: ${filePathFolderPreffixesLogValue}`);
 
   return filterChangedFiles;